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Rails Developer – Ad Platform API Integration (Meta/Google/LinkedIn)
Applied
$20 - $35
/ hr
4 minutes ago
Client Rank
- Medium
Payment method verified
Phone number verified
$660 total spent
5 hires, 2 active
10 jobs posted
50% hire rate,
1 open job
5.00
of 4 reviews
Registered: Sep 17, 2025
United States
San Rafael
23:37
3
This role requires production experience with advertising platform APIs.
THE OPPORTUNITY
──────────────────────────────────────
We're building an AI-powered marketing automation platform and need a developer to own our integrations. You'll build the backend services that connect Neyo to Meta, Google Ads, and LinkedIn.
You'll work alongside our Backend Lead and Claude API Developer with clear ownership of the platform integration layer.
THE WORK
──────────────────────────────────────
Meta Integration:
- Build Meta Marketing API services (pixel management, conversion tracking)
- Implement custom audience creation and lookalike audience services
- Develop ad set targeting (geo, demographic, interest/behavior)
- Create segment sync for audience uploads
LinkedIn Integration:
- Implement LinkedIn Marketing API for campaign operations
- Build matched audience upload with SHA256 hashing
- Create lead generation forms service with webhooks
- Develop conversion tracking and reach estimation
Google Ads Integration:
- Build validation services (conversion tracking, campaign settings)
- Implement negative keyword management
- Create sitelink extensions and URL validation
- Develop Performance Max readiness metrics
OAuth & Infrastructure:
- Implement automatic token refresh jobs
- Build channel status and disconnect APIs
- Create AES-256-GCM token encryption
- Design database schemas for platform configurations
TECH STACK
──────────────────────────────────────
- Rails 7.0.x
- PostgreSQL
- Sidekiq + Redis (background jobs)
- AWS (EC2, S3)
- RSpec for testing
- Meta Marketing API, Google Ads API, LinkedIn Marketing API
REQUIRED
──────────────────────────────────────
- 4+ years Ruby on Rails experience
- Production experience with at least ONE of: Meta Marketing API, Google Ads API, LinkedIn Marketing API
- OAuth 2.0 implementation (token refresh, secure storage)
- Strong REST API design and integration skills
- PostgreSQL database design
- Clear written English for async communication
PREFERRED
──────────────────────────────────────
- Experience with multiple advertising platform APIs
- Multi-tenant SaaS architecture
- Webhook implementation and event-driven design
- API rate limiting and retry strategies
- Marketing/advertising technology experience
HOW WE WORK
──────────────────────────────────────
- AI-assisted development (Claude Code) is how we build
- Async-first with documented handoffs
- Dev team based in Bangalore — sync at 1:30pm IST / 8:00am PST
- Sprint-based delivery (2-week cycles)
- Long-term engagement preferred
Zubair knocked it out of the park on a ServiceTitan integration project for us. He came in, got up to speed on our Rails…Zubair knocked it out of the park on a ServiceTitan integration project for us. He came in, got up to speed on our Rails codebase fast and wrote clean backend code that matched our existing patterns without hand-holding. Highly recommended.
Design, develop, and maintain scalable backend services using Go (Golang)
Build and optimize RESTful APIs and/or gRPC services
Design clean, maintainable system architectures for high-traffic applications
Work with databases (PostgreSQL, MySQL, Redis, etc.) and optimize queries
Implement authentication, authorization, and security best practices
Handle concurrency, performance tuning, and memory optimization in Go
Integrate with third-party services and internal microservices
Write clean, testable, and well-documented code
Participate in code reviews, technical discussions, and architecture decisions
Mentor junior developers and help raise engineering standards
Collaborate with DevOps on CI/CD, monitoring, and deployments
or our NLP-based customer support chatbot, Dibora Habite fine-tuned a GPT-3.5 model using Python (TensorFlow/NLTK) and i…or our NLP-based customer support chatbot, Dibora Habite fine-tuned a GPT-3.5 model using Python (TensorFlow/NLTK) and integrated it into our Slack workspace. Their expertise in preprocessing training data and optimizing response accuracy was outstanding. A+ work!"
Jul 2025 - Jul 2025 FIXED $5.26
Senior python developer
To freelancer:
5
Working with Rahel Melese was a fantastic experience. she developed a with precision and efficiency. her code was clean…Working with Rahel Melese was a fantastic experience. she developed a with precision and efficiency. her code was clean,modular and scabale. communication was excellent, and she delivered ahead of schedule. A true professional—highly recommended!
Algorithm-First React + Supabase Developer Needed to Validate & Launch Sports Analytics System
Applied
$45 - $70
/ hr
3 hours ago
Client Rank
- Medium
Payment method verified
Phone number verified
2 jobs posted
1 open job
no reviews
Industry: Engineering & Architecture
Individual client
Registered: Aug 1, 2025
United States
Williamsburg
00:37
3
I’m looking for an expert full-stack developer to help me take an existing sports analytics app from a working prototype into a reliable, production-ready system.
The priority is results, not UI polish.
My main focus is validating and improving the core logic / algorithm, ensuring it works correctly on real, live data, and defining clear success metrics (accuracy, consistency, performance). As long as the system works and produces repeatable results, UI can remain functional and minimal for now.
I already have:
• A fully built Lovable version of the app
• A separate HTML/React-based site
• Existing logic, data flows, and structure in place
I can share full access to the current codebase(s) with the right candidate.
⸻
What I’m looking for
• Someone comfortable stepping into an existing project
• Strong with React, Supabase, PostgreSQL, and API-based data
• Able to reason through algorithms, decision logic, and data validation
• Clear communicator who can explain why things work or don’t
• Focused on shipping a working, honest product
⸻
How I like to work
• Clear goals and priorities
• Direct, honest communication
• Iterative progress with quick feedback
• Results and validation over buzzwords
IMPORTANT notes
• You must be willing to sign an NDA before receiving full access
• This is an hourly, expert-level role
• U.S.-based talent only (U.S. time zones preferred)
If this sounds like your type of project, I’d like to hear:
1. Your experience with similar systems
2. How you approach validating logic or algorithms
3. A live or production project you’ve worked on
Client's questions:
Describe a time you worked on a system where correctness or performance of the logic mattered more than the UI. How did you validate that it was actually working?
When integrating live or external data into an application, what steps do you take to ensure the data feeding the algorithm is reliable and not producing misleading results?
What are common mistakes you see with Supabase or similar (Auth, RLS, or database design) in production apps, and how do you usually prevent or fix them?
Include a link to your GitHub profile and/or website
Describe your recent experience with similar projects
We are looking for an advanced Full-Stack Developer with strong experience in data-heavy systems, automation, and high-volume APIs.
You will work on multiple real-world projects, handling millions of data points, building internal tools, dashboards, and scalable infrastructures.
This is a hands-on engineering role, with growth potential toward a future technical lead / manager position.
🧠 Responsibilities
Build and optimize systems handling large volumes of data and API requests
Develop and maintain backend & frontend features
Create automation scripts and internal tools
Work on data processing, scoring, analytics and performance tracking
Build dashboards and interfaces using React
Improve scalability, performance, reliability, and structure
Communicate clearly with non-technical team members
Be proactive in architecture and technical decisions
🛠️ Tech Stack
Node.js / NestJS
JavaScript
React
PostgreSQL
Prisma
Data pipelines, API optimization, automation workflows
Nice-to-have (not mandatory):
Python for data processing
Basic ML / prediction logic (rules-based or simple models)
🎯 Requirements
3–5+ years as a Full-Stack Developer
Strong experience with data-heavy applications
Comfortable with multi-project environments
Autonomous, reliable, execution-oriented
Good communication skills
Able to take ownership and propose solutions
Comfortable with SEO and using IA
Must be able to work in Seminyak, Bali
💡 What We Offer
20M IDR / month (possibly to increase in the future)
Long-term, stable position
Multi-project, real-scale environment
Direct collaboration with the founder
Growth path toward technical leadership
🖋️ Can you answer these questions please :
Are you currently living in Bali or able to work on-site in Seminyak immediately?
Describe one project where you handled large datasets or high API volume.
What is your strongest skill: backend, frontend, or data processing?
Have you ever mentored or led other developers?
Fixed budget:
1,200 USD
3 hours ago
Client's recent history (5 works)
Translator english/burmese for social media project
To freelancer:
5
Aug 2022 - Dec 2024 FIXED $5.00
Translator english/burmese for social media project
To freelancer:
5
Aug 2022 - Dec 2024 FIXED $12.00
Engaging and viral video scripter in English
No feedback given
Jun 2023 - Jan 2024 FIXED $50.00
Video Script - Trial for client
To freelancer:
4.8
Udochi a fait un travail de qualité & rapidement.
La communication a été fluide et agréable tout au long du processus.
J…Udochi a fait un travail de qualité & rapidement.
La communication a été fluide et agréable tout au long du processus.
Je recommande Udochi pour vos scripts
To client:
5
Megane is a wonderful client. I enjoyed every bit of the project.
May 2023 - Jun 2023 FIXED $40.00
Translator english/burmese for social media project
Position Overview:
We’re looking for an experienced full-stack developer (or small team) to build a secure, responsive web platform for project tendering and assignment in the engineering and construction sector. The platform connects clients, authorities, suppliers, and contractors, enabling efficient project creation, bidding, management, payments, and more. This is a complete build based on a detailed blueprint (provided upon application), including front-end UI, back-end logic, databases, and integrations. We’re targeting a functional MVP with strong security and user experience, but for the initial delivery, all necessary buttons and UI elements should be in place (e.g., for navigation, forms, actions), even if their full backend functionality isn’t implemented yet—just placeholders or basic stubs where needed.
We’ve also created a Zoom whiteboard (shared upon application) that visually maps out all platform pages, including layouts and brief explanations of background processes (e.g., how data flows between pages like project creation to tendering).
Key Features and Requirements:
• User Roles and Flow: Support four user types (Clients, Authorities, Suppliers, Contractors) with role-based access and dashboards.
• Core Functionality:
• Landing page, registration (with role selection and role-specific fields like ABN, licenses, etc.), login with 2FA (email/SMS/authenticator app).
• Project creation/upload (documents, specs), tendering or direct assignment, bid submission/acceptance, progress updates.
• Project management (active/completed views).
• Invoices generation (PDF/on-screen) and payments: Direct BSB transfers (manual verification) and debit card processing via PCI-compliant gateway (e.g., Stripe, Square, Braintree supporting Visa/Mastercard/debit).
• Teams management (add members, assign roles/permissions).
• Knowledge base (tips & tricks, articles, videos, safety guidelines).
• User profile management and admin portal (full control: view/edit users, projects, payments; suspend accounts; audit logs).
• Front-End: Responsive UI (desktop/tablet/mobile) with left-side navigation. Public pages (home, about, contact) and logged-in pages (dashboard, projects, invoices, etc.). Include all buttons and interactive elements as per the whiteboard designs, even if non-functional initially. Strong security (HTTPS, CSP, XSS/CSRF/SQL protection, secure cookies, rate limiting, ReCAPTCHA).
• Back-End and Logic: Authentication/RBAC, API endpoints for project workflows, file storage (secure uploads with virus scanning), notifications (email/SMS), logging. Focus on setting up the structure first, with full functionality to follow if budget allows.
• Databases: Four separate user databases/schemas (Client, Authority, Contractor, Supplier) plus shared tables (Projects, Tenders, Invoices, Payments, Teams, Notifications, Audit Logs). Use PostgreSQL/MySQL with encrypted sensitive data (e.g., passwords via bcrypt, bank details).
• Tech Stack Suggestions (Flexible):
• Front-End: React/Vue/Angular + TailwindCSS/Bootstrap + JWT/OAuth2.
• Back-End: Node.js/Python (Django/Flask)/.NET/Java Spring.
• Other: Redis for caching, NGINX/Apache, cloud hosting (AWS/Azure/GCP).
• Security and Compliance: 2FA on login/reset/bank changes/admin; API rate limiting; audit trails.
• Additional: System architecture includes API gateway, application layer for logic (user/project/payment handling), database cluster, and file storage. Full schema details and whiteboard visuals available in spec.
Budget: $4000 USD (fixed, for complete MVP delivery including testing and deployment). Payment milestones can be negotiated, but complete funds will not be released until project completion.
Timeline: Estimated 4-8 weeks, depending on experience.
Qualifications:
• Proven experience building similar platforms (e.g., marketplaces, project management tools).
• Portfolio with secure web apps, payment integrations, and multi-user systems.
• Familiarity with Australian standards (e.g., ABN validation, BSB payments).
• Ability to work independently and communicate updates.
How to Apply:
Reply with your resume, portfolio links, a brief proposal (including how you’d approach the build, incorporating the whiteboard designs, and any tech preferences), and confirmation you can meet the budget/timeline. We’ll share the full Zoom whiteboard for detailed scoping.
Chatbot Integration and Postgres Migration
Applied
$1,500 - $3,000
4 hours ago
Client Rank
- not enough data
-
I'm looking to integrate a rule-based chatbot, supported by AI with human fallback, into my sales software. Additionally, I need to migrate the backend to Postgres.
The AI-powered chatbot should handle:
- Customer support
- Product recommendations
- Order tracking
- create orders in the Crm after admin payment confirmation so in this moments the bot receive order and it creates draft order in Shopify then the admin accept the order in earrings button.
The goal is for the backend to cover 75-80% of scenarios in the chat , with AI handling 20-25%.
The chatbot must integrate with:
- E-commerce platform (currently syncing with Shopify, wanting to add WooCommerce and Vtex)
- CRM system
Ideal skills and experience:
- Expertise in chatbot development and integration
- Experience with Postgres migration
- Familiarity with e-commerce platforms, especially Shopify, WooCommerce, and Vtex
- Strong background in CRM systems integration
Software is almost done just have to train the chat to cover de 75-80% of scenearios to reduce costs
Also is think to the lenguaje be segmented per country v1 - Colombia
Looking for a freelancer who can efficiently deliver this project within my budget.
Skills: PHP, CRM, MySQL, HTML, Shopify, PostgreSQL, AI Consulting, AI Chatbot, Chatbot Integration, AI Development
Fixed budget:
1,500 - 3,000 USD
4 hours ago
Websites, IT & Software, Design, Media & Architecture, Engineering & Science, Sales & Marketing, MySQL, HTML, Shopify, PostgreSQL, Editing, CRM, AI Consulting, AI Chatbot, Chatbot Integration, AI Development
Ruby-on-rails expert to work in a complex solution
Applied
$8 - $20
/ hr
4 hours ago
Client Rank
- Good
Payment method verified
Phone number verified
$2 834 total spent
10 hires, 5 active
7 jobs posted
100% hire rate,
1 open job
10.00 /hr avg hourly rate paid
77 hours paid
4.89
of 5 reviews
Registered: Oct 6, 2022
India
Pune
11:07
4
Looking for a reliable and professional Ruby on Rails developer to work on enhancements for our existing application. The ideal candidate will have experience with Rails, Ruby, and web development best practices.
*Responsibilities:*
- Develop and deploy features for our Rails application
- Collaborate with our team to identify and prioritize project requirements
- Write clean, efficient, and well-tested code
- Troubleshoot and debug issues
*Requirements:*
- 5+ years of experience with Ruby on Rails
- Strong understanding of web development principles and practices
- Experience with databases (e.g., PostgreSQL, MySQL)
- Familiarity with version control (e.g., Git)
If you're a motivated and experienced developer looking for a new challenge, let's connect!
- No AI generated application, keep it short
- apply only if you have worked on at-least 2 projects on Upwork.
- Only profile with video will be considered.
- Start your application with **Yewalewadi** for me to know you have read this till the end.
Power Apps - cross platform application development for on field data collection
No feedback given
Nov 2023 FIXED $1,532.77
Tax Consultant for Section 148 notice
No feedback given
Jul 2023 FIXED $30.00
SPXPERT Solutions - Expert Graphics Designer/ Video Editor
To freelancer:
5
This guy is a graphics wizard, hire him for all your graphics designing needs. Very honest and gets done what he promi…This guy is a graphics wizard, hire him for all your graphics designing needs. Very honest and gets done what he promises to do. I am very lucky to have found him on Upwork. Will keep on working with him on my future assignments.
Great job Ajay
To client:
5
Feb 2025 - Jun 2025 77 hrs @ $10.70/hr Billed: $829.24
Running Club Network - Application (Next-JS / ReactJS)
To freelancer:
3
I have had a difficult experience working with Akhil. Inspite of giving clear requirements and multiple extensions and …I have had a difficult experience working with Akhil. Inspite of giving clear requirements and multiple extensions and on time payments, this project was never completed and at the end we were not able to complete it. I have decided to close this project and move forward.
To client:
4
Dec 2024 - Feb 2025 FIXED $100.00
Scheduled Power Automate to save excel data to SharePoint List.
To freelancer:
5
It was great working with Goutham. He made himself available and also took extra efforts to get the project completed f…It was great working with Goutham. He made himself available and also took extra efforts to get the project completed for me. Asked right questions whenever in doubt and was committed to delivering a high quality outcome. Will definitely work with Goutham in future should the need arises.
To client:
4.65
Good
Aug 2023 - Sep 2023 FIXED $20.00
Dashboard and Report Development using Power BI
To freelancer:
5
helped me complete complex Power BI reports for construction business. He was very prompt in suggesting new ideas and a…helped me complete complex Power BI reports for construction business. He was very prompt in suggesting new ideas and always looking how we can improve the reports. Created great value for my clients and helped me complete the project successfully.
Will definitely hire him again for my future projects.
To client:
5
It was a amazing experience working with SPXPERT Solutions. All expectations and requirements were communicated up front…It was a amazing experience working with SPXPERT Solutions. All expectations and requirements were communicated up front and the client was responsive to any of my requests for clarification. I hope to work again with SPXpert Solutions.
Jul 2023 - Sep 2023 FIXED $22.20
I am looking for an Indian online Tax Filing consultant for consultation/guidance.
To freelancer:
5
Helped me filing ITR and also collecting right documents and information. It’s worth taking professional help.
To client:
5
I enjoyed working with Sudhir on this project. All requirements were communicated up front and the Sudhir was responsive…I enjoyed working with Sudhir on this project. All requirements were communicated up front and the Sudhir was responsive to any of my requests for clarification. Deadlines were set reasonable and were comfortably.
I liked working with him and hope to have the opportunity to work with her again.
This position is ideally suited for developers with hands-on experience in Python data pipelines and PostgreSQL reporting systems.
Project Summary
We are maintaining and extending an existing Python-based reporting pipeline that processes curated PostgreSQL data and generates static HTML dashboards for operational use.
The work is backend-focused and production-oriented (no frontend frameworks, no AI).
Core Responsibilities:
- Maintain and extend Python data pipelines
- Work with PostgreSQL views, reporting queries, and database-driven workflows
- Support event/trigger-based execution logic
- Generate and deploy static HTML reports (cloud storage)
- Operate within an existing, active codebase
Required Experience:
- Strong Python for data processing and automation
- Solid PostgreSQL knowledge beyond CRUD (views, reporting queries; triggers a plus)
- Experience with production reporting or ETL pipelines
- Comfortable reading and adapting existing code quickly
- Docker / docker-compose familiarity
Logistics:
- Immediate start
- 40 hrs/week availability
- Able to work aligned with US time zones
- Long-term engagement preferred
- Fluent English and clear communication
We value reliability, ownership, and calm execution.
Client's questions:
Have you worked on a production Python data pipeline (reporting, ETL, or automation)? Briefly describe what the pipeline did and your role.
What is your experience with PostgreSQL beyond basic CRUD? (e.g. reporting queries, views, performance tuning, triggers)
Do you have experience with event-driven or trigger-based workflows (database or pipeline level)? If yes, briefly explain.
Have you ever generated reports or files automatically from database data using Python? (HTML, CSV, Excel, PDF, dashboards, etc.)
How comfortable are you working inside an existing codebase and getting productive quickly? (Very / Comfortable / Some experience)
Looking for a Full-Stack Developer to Build a Networking Marketplace Website
Applied
$3,000
5 hours ago
Client Rank
- Risky
Payment method not verified
Phone number verified
1 jobs posted
1 open job
no reviews
Industry: Tech & IT
Individual client
Registered: Jan 9, 2026
United Arab Emirates
09:37
1
I’m looking for an experienced full-stack developer to build a clean, professional web platform that connects founders with investors/partners.
This is a discovery & networking platform only (NO payment handling between users, NO investment facilitation).
Scope (MVP):
• Responsive website (desktop + mobile)
• User roles: Founder / Investor
• User profiles
• Business idea listings (browse, search, filters)
• Internal messaging system (with limits)
• Hidden contact details (unlocked via subscription)
• Admin dashboard (basic moderation)
• Subscription/payment integration (platform fees only)
• Legal-safe structure (no ROI, no escrow, no deal tracking)
Important:
• You must understand marketplace platforms
• You must be comfortable building compliance-aware systems
• This is NOT a fintech or crowdfunding platform
Deliverables:
• Fully functional MVP
• Clean UI similar to modern startup platforms
• Deployment + basic documentation
Expert Next.js 15 & Supabase Developer for CRM/HRM Dashboard
Applied
$600
6 hours ago
Client Rank
- Medium
Payment method verified
Phone number verified
$525 total spent
2 hires, 1 active
20 jobs posted
10% hire rate,
1 open job
5.00
of 1 reviews
Industry: Tech & IT
Company size: 10
Registered: Aug 4, 2023
United Arab Emirates
Dubai
05:37
3
We are looking for a senior-level Next.js & Supabase developer to take over and evolve a semi-completed CRM / HRM / Dashboard system.
This is not a one-off task.
It’s a long-term collaboration where new features are added monthly.
About the System
The system is already live in development and includes:
Website Builder
Real Estate Module (properties, projects, listings)
1- CRM (leads, pipelines, activities)
2- HR Module
- Attendance
- Leave requests
- Meetings
- ...ect
3- Realestate Module
4- In-app Notifications System
The foundation exists, but it needs refactoring, optimization, and architectural improvements.
1- Codebase & Architecture
Refactor and clean existing Next.js 15 code
Improve performance, structure, and scalability
Apply best practices for large dashboards
New Features
Enhance and optimize DB structure
1- Add AI features by integrating with OpenAI
2- Build a chat system: (Messaging, Voice calls ,Video calls)
(Sendbird or a similar reliable provider)
4- Testing & Quality
Implement E2E testing using Playwright
Test full system cycles (auth → action → notification → permission)
Ensure production-ready stability
# Required Expertise (Non-Negotiable)
a. Next.js 15 (App Router, Server Components, Server Actions)
b. Supabase (deep experience, not basics)
RLS
Triggers
Realtime
Edge Functions
Dashboard & SaaS systems experience
Clean, scalable architecture mindset
Strong communication and documentation
# Nice to Have (Big Plus)
Previous CRM / HRM / SaaS platforms
Experience with Sendbird, Stream, or similar chat SDKs
AI integration experience (OpenAI, embeddings, assistants)
Performance optimization for large datasets
# Project Type
Long-term
Monthly feature expansion
You will become the core technical owner, not a task executor
Client's questions:
Please share links to projects similar to this one (CRM, HRM, SaaS dashboard, or admin systems).
Explain your exact role and what you personally implemented.
Share a project where you used Supabase as a backend (Auth, RLS, DB, Realtime, or Edge Functions).
Briefly explain:
- What Supabase features did you use?
- What problem did they solved
Have you implemented real-time features before (chat, notifications, live updates)?
If yes, mention:
- Provider or technology used (Sendbird, Stream, Firebase, Supabase Realtime, WebSockets, etc.)
- Your role in the implementation
Include a link to your GitHub profile and/or website
Describe your approach to testing and improving QA
We are building a web-based SaaS platform focused on structured professional development and career progression for international students and early-career professionals.
The platform is being piloted with UK universities and partner institutions and includes structured onboarding, step-based user journeys, dashboards, and data-driven decision logic.
We are looking for an experienced Full-Stack Software Developer to take ownership of features across the stack and work closely with product and strategy stakeholders in an early-stage but well-defined environment.
What You’ll Be Working On
Designing and building a production-ready SaaS web application
Implementing structured onboarding and multi-step user journeys
Developing backend logic for workflow-driven decision flows
Building internal and institutional dashboards (admin, staff, end-user views)
Integrating third-party services and APIs, including AI/LLM-based services
Working with relational data models to track user progress and outcomes
Collaborating closely with product, strategy, and design (this is not a ticket-factory role)
Required Skills & Experience
Strong professional experience with JavaScript and TypeScript
Front-end development using React and/or Next.js
Back-end development using Node.js or Python (FastAPI)
Experience designing and consuming REST APIs
Solid understanding of relational databases (PostgreSQL preferred)
Experience with authentication and authorisation, including role-based access
Experience building multi-step forms, wizards, or structured workflows
Familiarity with Git-based collaboration workflows
Proven experience delivering production-ready web applications
Nice to Have
Experience building or maintaining SaaS products
Experience with dashboard or analytics-driven interfaces
Familiarity with cloud deployment (AWS, Vercel, or similar)
Experience integrating AI / LLM APIs (e.g. OpenAI, Azure OpenAI)
Understanding of multi-tenant systems and institutional user models
Experience working in early-stage or fast-moving startup environments
Contract Details
Contract position
Fully remote (UK-based preferred)
Competitive rate, dependent on experience
Opportunity for ongoing work as the platform scales
How to Apply (Upwork-friendly filter)
When applying, please briefly share:
Relevant SaaS or dashboard-based projects you’ve worked on
Your experience across both frontend and backend
Any experience working on structured workflows or decision-based systems
Agency or Senior Developers Needed for HR Module Design and Development (SaaS)
Applied
not specified
6 hours ago
Client Rank
- Medium
Payment method verified
Phone number verified
$450 total spent
1 hires, 1 active
1 jobs posted
100% hire rate,
1 open job
no reviews
Registered: Dec 18, 2025
Cote D'Ivoire
Abidjan
01:37
3
We are seeking an agency or senior developers to design and build a secure, scalable HR module for our web-based B2B SaaS platform. The ideal candidate will have a strong background in HR software solutions and experience in creating modules that enhance user experience while ensuring data security. Collaboration with our team is essential to meet project milestones effectively. The goal is a modern, secure, multi-site / multi-project HR module suitable for structured organizations (NGOs, project management units, institutional teams).
HR Module Scope
Depending on your proposal and feasibility, the module will cover all or part of:
- Employee management
- Organization structure
- Leave & absence management
- Time & attendance
- Payroll
- HR documents (contracts, certificates, templates)
- Role-based access control (RBAC) + audit trail (logs)
- HR dashboards & reporting (baseline)
Expected Deliverables:
- Technical specification + backlog (user stories)
- Frontend + backend development + integration
- API documentation
- Testing (unit + integration) and quality review
- Staging deployment + installation/runbook documentation
Final handover: clean code, documentation, and short support for go-live
Ideal Profile:
- Agency or lead developer able to cover both frontend and backend
- Proven experience delivering B2B SaaS products (dashboards, RBAC, multi-tenant is a plus)
- Previous work on HRM/ERP/Finance/Internal systems is a plus
- Clear communication (English or French) and ability to work in sprints
Collaboration & Timeline
- Start: immediately
- Contract: fixed-price by milestones (based on your proposal)
If you have a proven track record in SaaS development and a passion for creating impactful software, we would love to hear from you.
Client's questions:
Please list any certifications related to this project
Describe your recent experience with similar projects
Include a link to your GitHub profile and/or website
Describe your approach to testing and improving QA
Zipix is a SaaS business communications platform.
This engagement is backend-only and focused on event processing and billing logic.
Product direction, UX flows, and overall architecture decisions are already defined.
The goal of this trial is to evaluate a backend engineer’s ability to implement clear specifications accurately and communicate progress reliably.
⸻
Backend Responsibilities
The backend owns the following areas:
• Node.js API development
• PostgreSQL schema design
• Event ingestion and storage (e.g., call start/end, duration)
• Stripe billing logic (usage-based / metered billing)
• Stripe webhook handling
• Data integrity and validation
⸻
Explicitly Out of Scope
The following are not part of this role or trial:
• UI / UX design
• Mobile app development
• Frontend frameworks
• VoIP / SIP / WebRTC implementation
• Product discovery or redefining workflows
⸻
Trial Scope (5–10 Days)
The paid trial will focus on a small, well-defined backend task, such as:
• Designing a minimal schema for usage/events
• Implementing one or more API endpoints
• Handling a Stripe webhook event
• Recording usage that would later map to billing
Exact tasks will be defined before the trial starts.
⸻
Definition of “Done”
Work is considered complete only when:
• APIs behave exactly as specified
• Data is stored correctly in PostgreSQL
• Stripe events are handled deterministically
• The implementation can be validated via logs, test calls, or sample payloads
• Acceptance criteria are met without assumptions
⸻
Engagement Principles
• Backend-only focus
• Written acceptance criteria
• Small, paid trial before any longer-term work
• Clear communication and daily progress updates
⸻
Next Step
If the trial is successful, follow-on backend work may be discussed.
If not, the engagement ends cleanly after the trial.
Hi! We are building a crypto analytics SaaS product focused on data-driven smart money trading intelligence.
The platform tracks on-chain wallet activity, analyzes real trades, and presents actionable insights for traders. The product already has designs in Figma (landings and the platform itself) and a clear roadmap. We are looking for a strong full-stack developer to help us build and scale the core system.
Please note that this is not a quick MVP or marketing site. We are building a real product with long-term potential.
What You’ll Work On
• Building and maintaining a modern SaaS dashboard
• Integrating on-chain data sources (wallet swaps, transactions, performance metrics)
• Backend logic for wallet tracking, trade aggregation, and analytics
• APIs (internal + external) for signals, bots, and future integrations
• Working with product designs (Figma) and improving UX where needed
• Preparing the platform for future features (perps)
Tech Stack (Flexible, but expected experience)
• Frontend: React/Next.js/TypeScript
• Backend: Node.js/NestJS/Python (open to suggestions)
• Databases: PostgreSQL/ClickHouse/Redis
• Web3: EVM chains, on-chain data indexing, RPCs, third-party data providers
• Infra: AWS/Vercel/Docker
• Experience building SaaS products is a big plus
What We’re Looking For
• Strong full-stack experience (not just front-end)
• Real experience with Web3/blockchain data
• Ability to think in systems, performance, and scalability
• Comfortable working with an existing product vision (not just following tickets)
• Good communication and ownership mindset
Bonus points if you’ve worked on:
• Crypto analytics platforms
• Trading tools
• Bots, signals, or copy trading systems
Engagement Details
• Long-term collaboration preferred
• Flexible hours, async-friendly
• Competitive budget based on experience
How to Apply
Please include:
1. Relevant Web3 / SaaS projects you’ve worked on
2. Your role in those projects
3. Your preferred stack
It was a pleasure working with Taras, Dmytro and the whole team! They delivered polished, modern designs that matched ou…It was a pleasure working with Taras, Dmytro and the whole team! They delivered polished, modern designs that matched our product vision very well, and were responsive to feedback throughout the process. Communication was smooth and deadlines were met without issues. Overall, a very solid collaboration, and I would definitely consider working together again in the future.
To client:
5
We were very happy to work with such a client!
It was a pleasure to work together on such a complex project! The techni…We were very happy to work with such a client!
It was a pleasure to work together on such a complex project! The technical specifications were very clearly written and Vlad was always in touch, which helped to make the project something we are proud of. We will be happy to work with you again in the future!
I need an experienced TIBCO Spotfire developer to rebuild an existing multi-page operational dashboard using my data source and requirements shared during onboarding.
The work includes:
Building a clean Spotfire analysis with multiple pages (KPIs + charts + tables)
Implementing interactive filtering, marking, and drilldowns
Creating time-based visuals (timeline-style) and performance/latency-style metrics
Applying data freshness/SLA-style logic (threshold-based status)
Ensuring good performance and reusable structure
Skills required
Strong Spotfire development (analysis design, expressions, calculated columns)
Filters/marking schemes, data relationships, and UX layout
Experience with time-series dashboards and KPI design
Optional: IronPython scripting (nice-to-have, not required)
Deliverable: Spotfire .dxp + brief setup notes. Please share 1–2 similar Spotfire dashboards you’ve built and your approach.
Budget:
not specified
7 hours ago
Client's recent history (6 works)
PBI Sales Report
To freelancer:
5
Great job done and delivered timely
To client:
5
Oct 2025 - Nov 2025 FIXED $150.00
PowerBI Exam Report
No feedback given
To client:
5
Work Completed Successfully
Jul 2024 - Jul 2024 FIXED $140.00
Employee Privacy and Electronic Monitoring
To freelancer:
4
To client:
5
Great Client!
Sep 2018 - Oct 2021 FIXED $575.01
Simplified Forecasting Stock Price in R
To freelancer:
4.05
To client:
1.6
The client seemed reasonable at first, but constantly changed the delivery requirements with no regard to work previousl…The client seemed reasonable at first, but constantly changed the delivery requirements with no regard to work previously done and agreed upon. Eventually the contract was ended early and I returned escrow funds we had already agreed upon after I had finished the work. Would not recommend this client at all.
Mar 2019 - Apr 2019 FIXED $65.00
Create a Entity Relational Diagram (database modeling) - Using limited information
To freelancer:
5
Was patient with me, and we completed the job despite having him to work into 3 am in the night. I appreciate his approa…Was patient with me, and we completed the job despite having him to work into 3 am in the night. I appreciate his approach and sense of overall understanding of the project
To client:
5
Great Client! Looking forward to work with him again.
Oct 2018 - Oct 2018 FIXED $40.00
Statement of Purpose
To freelancer:
5
Awesome guy, I will always hire him again. He did a fantastic job on my resume, cover letter and essays. Always communic…Awesome guy, I will always hire him again. He did a fantastic job on my resume, cover letter and essays. Always communicating
To client:
5
Great client to work with. Sets reasonable deliverables and communicates extremely well. Very professional and willing t…Great client to work with. Sets reasonable deliverables and communicates extremely well. Very professional and willing to provide you with more information as needed to ensure the project goes as smoothly as possible. I certainly recommend that contractors consider working with him whenever the opportunity arises.
Looking for an engineer familiar with Typescript, Postgres and React development to work on web application projects for a political donor fundraising CRM.
This is for general support and could end up being a lot of hours long term.
I prioritize authentic and brief communicators - three handwritten sentences will get you a lot further with me than copypasta :)
We have complex projects that range from backend to frontend design. It helps if you have a background in self learning languages like Rust (we don't use Rust but I've found this a positive signal in past hiring), managing servers, have a portfolio of React applications you've designed and implemented, or have open source work or a blog to point to.
Jan 2026 - Jan 2026 6 hrs @ $3.53/hr Billed: $22.38
Product manager for CRM
No feedback given
Jan 2026 - Jan 2026 12 hrs @ $11.61/hr Billed: $143.21
Help documentation writing for CRM software
To freelancer:
5
To client:
5
Working with Zac was an great experience. He is very easygoing and approachable, which made communication smooth and enj…Working with Zac was an great experience. He is very easygoing and approachable, which made communication smooth and enjoyable throughout the project. His deep knowledge in his field shows in the clarity and precision of his feedback. Zac is kind, professional, and always makes expectations clear. I’d be happy to work with him again in the future.
Mar 2025 - Oct 2025 80 hrs @ $9.31/hr Billed: $745.11
Levina is 10/10 writer and partner is crafting documentation and making large project plans. You will seriously apprecia…Levina is 10/10 writer and partner is crafting documentation and making large project plans. You will seriously appreciate hiring her. We contracted her for 6 months to build out our entire documentation site and were very, very happy with the work she did -- we were very lucky to have found such an excellent partner in her.
To client:
4.65
Definitely appreciate all the trust during my assignment here.
Zach truly give me healthy freedom to complete my task …Definitely appreciate all the trust during my assignment here.
Zach truly give me healthy freedom to complete my task using my approach and always open for any feedback. He also is very hands on helping me resolving any challenges during my assignments.
Thank you for all the growth and learn I get through the assignments
May 2025 - Aug 2025 15 hrs @ $14.86/hr Billed: $230.32
Data pipeline engineer for political donor data scraping
To freelancer:
5
10/10, Fauzan will be one of the most impressive people you ever hire. I speak as a fellow developer.
To client:
5
Amazing client to work with! Couldn't ask for a better client! Super technical client, everything is clear, and super ea…Amazing client to work with! Couldn't ask for a better client! Super technical client, everything is clear, and super easy to communicate with!
Feb 2025 - Aug 2025 478 hrs @ $11.81/hr Billed: $5,641.30
Jun 2025 - Jun 2025 1 hrs @ $4.88/hr Billed: $6.50
Full-stack software engineer for political fundraising donor CRM application
To freelancer:
5
To client:
4.85
I’ve really enjoyed working with Zach. He’s a very talented leader and a great team player. Working alongside him has gi…I’ve really enjoyed working with Zach. He’s a very talented leader and a great team player. Working alongside him has given me the opportunity to learn and grow professionally. I truly appreciate his support and collaboration. Hopefully, we’ll get a chance to work together again in the future!
Mar 2025 - May 2025 48 hrs @ $11.94/hr Billed: $571.12
Full-stack software engineer for political fundraising donor CRM application
To freelancer:
5
Elias is an excellent and meticulous developer. Highly recommend working with him, had a great experience and wrapped up…Elias is an excellent and meticulous developer. Highly recommend working with him, had a great experience and wrapped up projects successfully!
To client:
4.7
It was a pleasure working with him and his team. They were very helpful, professional, and supportive throughout the pro…It was a pleasure working with him and his team. They were very helpful, professional, and supportive throughout the project. Communication was generally clear and timely, which made collaboration smooth. I especially appreciated their openness to suggestions and prompt responses.
One small area for improvement could be in providing a bit more detailed feedback during review phases to help speed up iterations. That said, overall, it was a great experience, and I would definitely recommend him.
Mar 2025 - May 2025 108 hrs @ $12.89/hr Billed: $1,390.42
Data pipeline engineer for political donor data scraping
To freelancer:
5
M. Fahmi is a fantastic and meticulous engineer. I strongly recommend him.
To client:
4
Feb 2025 - May 2025 72 hrs @ $7.38/hr Billed: $529.81
Help documentation writing for CRM software
To freelancer:
5
Excellent work!
Feb 2025 - May 2025 30 hrs @ $6.93/hr Billed: $204.45
Data pipeline engineer for political donor data scraping
Full-stack software engineer for political fundraising donor CRM application
To freelancer:
5
To client:
5
good client to work with.
Feb 2025 - Mar 2025 5 hrs @ $9.23/hr Billed: $41.53
Help documentation writing for CRM software
To freelancer:
4.8
Feb 2025 - Mar 2025 5 hrs @ $2.05/hr Billed: $10.26
Help documentation writing for CRM software
To freelancer:
4.8
To client:
1
Some clients waste your valuable time by asking you to write samples without clear instructions as if it's a little joke…Some clients waste your valuable time by asking you to write samples without clear instructions as if it's a little joke. Then, they come with no response whether they would like to hire or not and quietly end the contract. It has such a negative impact on our profiles. This person is one such client. Do not recommend at all.
Mar 2025 - Mar 2025 3 hrs @ $0.00/hr
Help documentation writing for CRM software
To freelancer:
4.6
Mar 2025 - Mar 2025 3 hrs @ $0.00/hr
Full-stack software engineer for political fundraising donor CRM application
To freelancer:
5
To client:
5
Feb 2025 - Mar 2025 3 hrs @ $14.12/hr Billed: $35.31
Data pipeline engineer for political donor data scraping
To freelancer:
4.7
To client:
5
Very humble
Feb 2025 - Feb 2025 7 hrs @ $7.67/hr Billed: $53.71
Data pipeline engineer for political donor data scraping
To freelancer:
5
Extremely professional! Thanks for working with us.
To client:
5
Zack is an exceptional client who truly understands and supports you, making him someone you’d always want to work with.
Full-Stack Engineer Needed for Financial Control System Development
Applied
$40 - $60
/ hr
8 hours ago
Client Rank
- Medium
Payment method verified
Phone number verified
$287 total spent
1 hires, 1 active
2 jobs posted
50% hire rate,
1 open job
no reviews
Industry: Tech & IT
Individual client
Registered: Dec 20, 2025
United States
remote
23:37
3
We are building RELEN, a backend-first financial control system for real estate portfolios.
This is not an accounting app or banking product. The core work is implementing deterministic logic around spending intent, exposure, reconciliation, and financial safety with reporting outputs as a result of the system.
We’re looking for a senior full-stack engineer comfortable owning backend logic and wiring a thin dashboard on top, without overengineering or moving business rules into the UI.
PostgreSQL + PostGIS Developer for Property Data Platform
Applied
$10 - $15
/ hr
9 hours ago
Client Rank
- Risky
Payment method not verified
Phone number verified
1 open job
United States
23:37
1
We're building a B2B SaaS platform that helps home services companies work with property data.
What we need built:
PostgreSQL database with PostGIS extension
Import and manage large property datasets (500K+ records per market)
Geographic queries (find all properties within X miles of a point)
Simple clustering algorithm (group nearby addresses into zones)
Parse KML/Shapefile map files and match to property records
Basic scoring system (rank properties by multiple attributes)
REST API endpoints for the above
Tech stack:
PostgreSQL + PostGIS
Node.js or Python (your preference)
Supabase or self-hosted (we can discuss)
Requirements:
Strong PostgreSQL experience (3+ years)
PostGIS or geographic/spatial data experience (required)
Can write efficient queries on large datasets
Clean, documented code
Available for weekly video calls (US Central timezone overlap)
Good English communication
To apply, please share:
Relevant past projects (links)
Your experience with PostGIS or geographic data
Your availability and hourly rate
Brief answer: How would you structure a query to find all properties within 15 miles of a point and cluster them into 5 groups?
Hourly rate:
10 - 15 USD
9 hours ago
Web, Mobile & Software Dev, Other - Software Development
Senior Rust Engineer for High-Frequency Micro-Trading Bot
Applied
$30 - $45
/ hr
9 hours ago
Client Rank
- Risky
Payment method not verified
Phone number verified
1 open job
United States
23:37
1
We are seeking a High-Performance Rust Architect to lead the technical implementation of an automated micro-trading and arbitrage system. The project focuses on prediction markets (Polymarket, Kalshi) and cross-exchange price alignment.
You will not be starting from scratch; we have identified several core open-source frameworks (e.g., dr-manhattan-rust, poly-kalshi-arb) that need to be audited, integrated, and optimized for live execution.
Key Responsibilities
• System Integration: Deploy and customize existing Rust-based trading bots for Polymarket and Kalshi.
• Latency Optimization: Ensure the execution engine handles WebSocket feeds and order placement with millisecond precision.
• Reliability: Implement robust error handling, rate-limiting management, and safety "kill-switches".
• Data Logging: Ensure all trading activities (PnL, order logs) are structured for future automated reporting.
Required Skills
• Expert-level Rust: Deep experience with Tokio, Serde, and high-concurrency patterns.
• Trading Logic: Solid understanding of order books, AMM mechanics, and arbitrage strategies.
• Backend Mastery: Proficiency in PostgreSQL/DynamoDB for high-volume trade logging.
• Proven Track Record: Must have experience building low-latency systems or blockchain-related execution engines (Solana experience is a plus).
Application Questions (Must Answer)
1. How do you handle WebSocket connection drops in Rust to ensure the bot doesn't miss critical price movements?
2. Explain your approach to managing API Rate Limits when scanning multiple market pairs simultaneously.
3. Have you worked with dr-manhattan-rust or similar prediction market bots before?
Client's questions:
Describe your recent experience with similar projects
Please list any certifications related to this project
Include a link to your GitHub profile and/or website
What frameworks have you worked with?
Describe your approach to testing and improving QA
Senior Full-Stack Developer Needed for SaaS Platform Development
Applied
$500
9 hours ago
Client Rank
- Medium
Payment method verified
Phone number verified
$603 total spent
2 hires, 1 active
1 jobs posted
100% hire rate,
2 open job
30.00 /hr avg hourly rate paid
8 hours paid
3.80
of 1 reviews
Company size: 2
Registered: Jan 12, 2025
United States
Westland
00:37
3
We are seeking an experienced senior full-stack developer to join our team and lead the next critical phase of our SaaS platform development. The ideal candidate should have a strong background in both front-end and back-end technologies, with a proven track record of delivering high-quality, scalable web applications. You will work closely with our product team to implement new features and improve existing functionalities. If you are passionate about building innovative software solutions, we'd love to hear from you! Bug Report will be attached on acceptance of job.
Important Notes
This role is for someone who can:
Take ownership
Work from real QA feedback
Ship real production features
And help push a real product toward launch
This is not a small task, and we are looking for a serious, senior-level developer.
Scope of Work
1. Bug Fixing & Stabilization:
Work from an existing QA bug report
Fix critical and high-priority issues
Ensure frontend, backend, and database are properly integrated
Improve overall system reliability and data flow
2. Stripe Payments (High Priority):
We need full, production-grade Stripe functionality, including:
Subscription plans & pricing tiers
Signup → plan selection → payment flow
Proper backend handling and webhooks
Reliable subscription lifecycle (upgrade, cancel, renew)
3. Postmark Email Integration:
We need a fully functioning email system, including:
Transactional emails (signup, confirmations, etc.)
Campaign-related email sending
Reliable delivery via Postmark
4. Campaign Mode Features:
We are building a “Campaign Mode” with features such as:
Social media integrations (posting to social platforms)
AI-generated campaign content
Saving and sending campaign files
Tracking engagement (opens, interactions, stats)
Emails sent individually (not bulk blast – personalized sends)
5. Bulk Uploader:
Ensure the bulk uploader is fully functional, stable, and production-ready.
Full Stack Tanstack Start & NestJS dev for project completion
Applied
$500
9 hours ago
Client Rank
- Medium
Payment method verified
Phone number verified
4 jobs posted
25% hire rate,
1 open job
no reviews
Registered: Nov 10, 2025
Saudi Arabia
Riyadh
08:37
3
Calendaty is an AI-powered scheduling platform. We’re growing fast and looking for a Full-Stack Developer who’s passionate about building scalable, high-quality products using modern TypeScript-based stacks.
Work Goal:
You will be working on completing v2 of Calendaty, we've at least 60% done already, we want you to help us finish the rest of this version fast.
What We Expect:
- Proven experience building end-to-end web apps using NestJS and React/TanStack Start
- Strong grasp of TypeScript, PostgreSQL, and clean architecture patterns
- Ability to follow and maintain existing code structure & best practices
- Write well-structured, maintainable, and testable code (unit & integration tests)
- Deliver on time, with a strong sense of ownership
- Ability to learn fast and adapt to evolving technologies
- Understanding of scalable backend design and API documentation
- Being able to deliver high quality design with user stories only without Figma, etc with a very good taste
- Being able to handle workload
- Able to be reachable outside of work hours for critical prod bugs, or anything urgent
Nice to Have:
- Experience with microservices and Dockerized deployments
- Familiarity with GitHub Actions CI/CD pipelines
Why Join Calendaty:
- Work on a next-generation AI scheduling platform used by real customers worldwide
- Collaborate in a modern tech environment with a developer-first mindset
- Opportunity to grow alongside a rapidly expanding SaaS product
Client's questions:
Your Linkedin Profile
Describe your recent experience with similar projects
Web App Development – Parental Control Platform (Private Use)
Applied
$600
9 hours ago
Client Rank
- Medium
Payment method verified
Phone number verified
3 jobs posted
1 open job
no reviews
Industry: Tech & IT
Company size: 10
Registered: Oct 29, 2025
Pakistan
Islamabad
10:37
3
We are seeking a skilled full-stack web developer or development team to build a secure parental control web application, functionally inspired by KidsGuard Pro, with custom workflows and logic tailored for private/internal use.
This project is development-only. All UI/UX designs, user flows, and design assets will be provided by our team. The selected developer(s) will be responsible for implementing the system architecture, backend services, APIs, and frontend logic strictly according to the supplied designs.
Scope of Work:
1. Implement a web-based parental control system using provided UI/UX designs
2. Develop backend services, REST/GraphQL APIs, and database schemas
3. Build role-based access control (parents/admins)
4. Implement monitoring, logging, and reporting modules
5. Ensure secure data handling, encryption, and authentication
6. Optimize performance, scalability, and maintainability
7. Provide clean, modular, and well-documented code
Technical Expectations:
1. Strong experience with modern frontend frameworks (React, Vue, or similar)
2. Backend experience with Node.js, Laravel, Django, or equivalent
3. Database design experience (PostgreSQL, MySQL, MongoDB, etc.)
4. Familiarity with authentication (JWT/OAuth), secure APIs, and data protection
5. Experience implementing dashboards and data-driven interfaces
6. Understanding of privacy-focused and security-sensitive applications
Project Constraints:
1. This is not a clone and not intended for public distribution
2. Application is for private/internal use only
3. Designs will be fully provided; no design work is required
4. NDA may be required prior to sharing detailed specifications
5. Feature set, tech stack, and milestones will be finalized after initial discussion
Developers with prior experience in monitoring tools, parental control systems, or security-oriented applications are highly preferred.
Full-Stack web developer + AI backend Engineer
Applied
$300
10 hours ago
Client Rank
- Risky
Payment method not verified
Phone number verified
1 open job
no reviews
Registered: Jan 24, 2026
India
11:07
1
Building AI based EdTech web application for students. We need someone who can build:
Backend (APIs + database)
Design and implement a database.
Deployment + developer readiness
Dockerized local dev setup
Staging deployment
Basic logging + monitoring
Clear documentation for setup + APIs
vector embeddings for semantic similarity matching
Building data storage pipeline and create vectors
Ability to understand and adopt open source technologies.
Tech background which is preferred:
Strong backend experience (Node.js NestJS/Express or Python FastAPI/Django)
DB schema design + migrations
File uploads, background jobs/queues, auth (JWT/OTP)
Integrating LLM APIs + search/retrieval
Deploying production services (Docker + cloud)
Nice-to-have:
EdTech content systems
We will provide UI designs and working prototype but the person should be able to make fixes and review the UI code as needed to plug the UI interactions with the backend.
We want an MVP-ready build in 6–8 weeks with weekly milestones and demos. We expect:
Full stack AI Native Engineer for Long Term Project
Applied
$15 - $35
/ hr
10 hours ago
Client Rank
- Excellent
Payment method verified
$30 063 total spent
23 hires, 12 active
24 jobs posted
96% hire rate,
1 open job
8.57 /hr avg hourly rate paid
2 286 hours paid
5.00
of 15 reviews
Company size: 10
Registered: Jan 3, 2020
United States
Bellevue
21:37
5
Flutter Developer — AI Health App (Full-time, Long-term)
We're building RootWell, a mobile app helping people discover food triggers behind their chronic symptoms. Think "Noom meets functional medicine."
You'll build:
Flutter mobile app (iOS first) with Supabase backend
AI-powered food photo analysis using Claude API
Symptom tracking with pattern detection
Apple HealthKit integration
Recipe library with dietary filtering
Requirements:
Proficient with Claude Code — non-negotiable. We use AI-assisted development heavily and expect you to ship faster because of it.
Flutter experience with production mobile apps
Enterprise software background — you've built and shipped software in professional team environments with code reviews, CI/CD, proper architecture, and documentation standards
Strong Dart, TypeScript, REST APIs, PostgreSQL
Independent worker, strong written English
40+ hrs/week with US Pacific overlap
Located in: Addis Ababa and ideally have a CS degree from Addis Ababa University.
Why join: Ground floor startup, meaningful product, modern stack, clear specs. We're an AI-forward team — you'll pair with Claude daily, not fight legacy code.
Likely will need to recruit a team of developers.
To apply:
Brief intro + why this interests you
GitHub repos of projects you've built using Claude Code — required, not optional
Flutter apps live in App Store/Play Store
Describe your enterprise experience — team size, architecture patterns, deployment processes
Your Claude Code workflow — how do you prompt, iterate, review?
Availability
Really appreciate Pawan and his efforts to help our business with SEO.
To client:
5
Great Client Thank you!
Apr 2023 - Feb 2024 FIXED $1,215.83
SEO work for Junk Removal Business
To freelancer:
5
To client:
5
Ben provided clear instructions and made the entire process smooth and efficient. Hope to have the opportunity to work w…Ben provided clear instructions and made the entire process smooth and efficient. Hope to have the opportunity to work with him again.
May 2023 - Feb 2024 331 hrs @ $10.56/hr Billed: $3,495.32
Jan 2023 - Jun 2023 200 hrs @ $3.96/hr Billed: $793.27
Podcast Audio Editor
To freelancer:
4.6
Mar 2022 - May 2023 4 hrs @ $14.00/hr Billed: $60.67
Pacific Build Website Redesign
To freelancer:
5
Murad is amazing - he's done a number of different projects for us and we'll use him for more in the future!
To client:
5
Feb 2023 - Feb 2023 FIXED $369.27
Find/build a tool to search popular job sites for keywords relating to crypto
No feedback given
To client:
5
Ben was my first Upwork client and is always wonderful to work with!. He always has new creative ideas. Requirements wer…Ben was my first Upwork client and is always wonderful to work with!. He always has new creative ideas. Requirements were clear, we had regular interactions, he is knowledgeable about the product he is creating. I learned a lot while working with Ben. Looking forward to more collaboration in the future.
May 2021 - Oct 2022 105 hrs @ $30.00/hr Billed: $3,150.00
Benefits verification for dental practice
No feedback given
To client:
5
Thank you Ben and Molly for being such a great client I ever worked with. They are understanding of your learning proces…Thank you Ben and Molly for being such a great client I ever worked with. They are understanding of your learning process.
Nov 2021 - Feb 2022 301 hrs @ $5.00/hr Billed: $1,504.18
Video editing of drone video
No feedback given
To client:
5
I had an amazing experience working with Ben. I loved editing his footage. Great views.
Dentistry branding including logo rework and brand guide
No feedback given
To client:
5
May 2020 - Jan 2021 FIXED $150.00
Part 68 Test Consulting Review
To freelancer:
5
Thank you very much for all your help, it was amazing that you reproduced the issue and helped us solve it so fast!
I a…Thank you very much for all your help, it was amazing that you reproduced the issue and helped us solve it so fast!
I appreciate your dedication to our challenge, the speed and professional approach you gave us.
You were respectful of our budget as helped us solve the problem much quicker than we expected.
It was an amazing experience working with you and I hope we'll cross paths again!
To client:
5
Ben and his team are very professional, communicate clearly, and are all around easy to work with. I really enjoyed wor…Ben and his team are very professional, communicate clearly, and are all around easy to work with. I really enjoyed working on this project and hope to work with them again in the future.
Nov 2020 - Dec 2020 6 hrs @ $165.00/hr Billed: $1,045.00
Long-Term React + Supabase Full-Stack Developer for Live SaaS Platform
Applied
not specified
10 hours ago
Client Rank
- Risky
Payment method not verified
Phone number verified
1 open job
Israel
07:37
1
Current Platform the system includes:
* A **client dashboard** where each business logs in and manages its items/content
* A **separate public-facing project** that displays each client’s items via their own URL
* A **multi-tenant architecture** (many clients, isolated data)
* Production database and real users
I already have clients using the platform and more waiting, so I need someone dependable for ongoing work.
1. Database Security & Scalability (Supabase)
* Review and improve the current database structure
* Ensure proper **Row Level Security (RLS)** policies
* Guarantee strict **data isolation between clients (multi-tenant security)**
* Improve relationships, indexing, and performance
* Prepare the system to scale as the number of clients grows
I need someone who understands SaaS database design, not just basic CRUD.
2. Dashboard Improvements (Design Controls)
Enhance the client dashboard by adding:
* More **design customization options** (colors, visual styles)
* One additional **frontend template** clients can select for their public page
* Can be a simple showcase-style layout
This involves both dashboard UI and frontend template logic.
3. Payments (Optional Per Client)
Some clients will accept orders, others will not.
We need to:
* Add a **database flag per client** to enable/disable payments
* Activate ordering and payment flow only if enabled
* Integrate this payment API:
[https://grow-il.readme.io/](https://grow-il.readme.io/)
If disabled → display only
If enabled → ordering + payments active
What I’m Looking For
* Strong React + TypeScript skills
* Solid Supabase and PostgreSQL experience
* Experience with SaaS or multi-tenant systems
* Ability to work with an existing codebase
* Good communication and reliability
* Interested in **long-term collaboration**
This project is ongoing. I prefer a strong long-term developer over the cheapest option.
Full Stack Developer needed to build an AI Agent
Applied
$120
10 hours ago
Client Rank
- Medium
Payment method verified
Phone number verified
1 open job
Canada
01:37
3
We are looking for an experienced Full Stack AI Developer to build an end-to-end AI Agent system that includes one voice agent and one SMS agent, along with complete workflow automation.
This project involves designing, developing, and integrating AI agents that can interact with users via voice calls and SMS, powered by modern AI tools and automation platforms.
Project Scope
Build one Voice AI Agent using Retell
Build one SMS AI Agent using GoHighLevel (GHL)
Design and implement the entire workflow using n8n
Integrate APIs, webhooks, and external services as required
Handle conversation flow, logic, and triggers
Ensure smooth communication between voice, SMS, backend systems, and databases
Set up logging, error handling, and basic monitoring
Deliver a scalable and maintainable solution
Tech Stack & Tools (Must-Have Experience)
n8n (workflow automation & orchestration)
Retell (Voice AI agent integration)
GoHighLevel (GHL) for SMS automation
AI/LLM integrations (OpenAI or similar)
REST APIs & Webhooks
Backend development (Node.js / Python preferred)
Basic frontend or dashboard experience (nice to have)
Database handling (PostgreSQL / MySQL / MongoDB – any)
Nice to Have
Experience building AI agents or conversational AI systems
Experience with voice bots, IVR, or telephony systems
Knowledge of prompt engineering and conversation design
Experience with automation-heavy systems and integrations
Deliverables
Fully functional voice agent (Retell)
Fully functional SMS agent (GHL)
Complete n8n workflows
Clear documentation of setup and flows
Clean, production-ready code
Who Should Apply
You’ve built AI agents or automation workflows before
You are comfortable owning a project end-to-end
You can think in terms of flows, triggers, and automations, not just code
You can communicate clearly and provide progress updates
How to Apply
Please include:
Relevant past projects (AI agents, automation, voice/SMS bots)
Quiero lanzar un sistema de menús digitales accesible directamente desde una página web, pensado para que cualquier restaurante, cafetería o bar pueda mostrar su carta sin imprimir ni repartir folletos.
¿Qué necesito?
• Un sitio web responsive que muestre categorías, platos, precios e imágenes de forma clara y atractiva.
• Un panel de administración sencillo que permita añadir, editar o desactivar productos en cuestión de segundos; la actualización de menús fácilmente es la prioridad número uno.
Alcance inicial
Busco una versión funcional que incluya:
1. Estructura de base de datos para menús y categorías.
2. Interfaz pública orientada a cliente final (diseño limpio, carga rápida).
3. Panel privado protegido con login, con campos básicos (nombre del plato, descripción, precio, foto, estado activo/inactivo).
4. Opciones de idioma y moneda configurables desde el panel.
Tecnologías sugeridas (abiertas a propuesta):
– Front-end: React, Vue o estándar HTML5/CSS3 con Bootstrap/Tailwind.
– Back-end: Node.js, Laravel o Django.
– Base de datos: MySQL o PostgreSQL.
Me interesa un código bien documentado y la posibilidad de escalar en el futuro a funciones como analíticas de ventas, control de inventario o lectura vía código QR.
Entrega esperada: repositorio o archivo comprimido listo para desplegar, breve guía de instalación y un video o captura explicativa del flujo de alta y edición de productos.
We're looking for a talented frontent developer (who ideally has backend experience with Django/python) to join our growing team.
Our product is in the medical research space, involving clinical data and literature.
Our stack is:
vue3 on the frontend
Django/Python on the backend
Postgresql
Deployed via Heroku
Communication is done via slack + Jira
Looking for someone who starts quickly and can produce good quality frontends from Figma designs. Strong written communication is preferred.
Please share some project samples, code samples, or open source contributions so we can get to yo know you!
About us:
We're a fast moving medical software startup with real world experience and real customers. Funded and growing quickly, we need operators who can produce results immediately, who aren't afraid to try and ask for feedback.
LLM and Langchain Langgraph Engineer for Healthcare
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Urgent Need: Elementor WordPress Developer to Implement Figma Design
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5
Ben did a really nice job! We will hire them again when additional work is needed.
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5
Working on this project with Ethan and their team was challenging and I enjoyed all of it. They gave me freedom to solve…Working on this project with Ethan and their team was challenging and I enjoyed all of it. They gave me freedom to solve the variety of coding needs in ways I best saw fit, which was great. Would recommend to others and would be happy to work with them again!
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Kaye is a smart and thoughtful PM, just wasn't ultimately the fit for our team!
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4.85
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Account Executive with Sales Experience and CRM Expertise - Healthcare/Medical device
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5
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Digital Marketing Manager for Content and SEO
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2
The initial work that Victor delivered was very good. As we continue the relationship, we faced issues with hours being …The initial work that Victor delivered was very good. As we continue the relationship, we faced issues with hours being billed ahead of deliverables and tasks that were not completed within the billed timeframe. When we asked about the discrepancies, the explanations did not align with expectations, and this affected trust in the process. We appreciate the effort, but the engagement did not meet the standards we required.
To client:
1.55
Most of the project went smoothly and earlier deliverables were aligned, completed, and approved without issues. Toward …Most of the project went smoothly and earlier deliverables were aligned, completed, and approved without issues. Toward the end of the engagement, there was a misunderstanding about expectations related to the time required for the final tasks. Work that had already been scoped, delivered, and approved was later reconsidered, which created some confusion around the hours involved.
I recommend making sure that future engagements start with clear definitions and stable expectations so everything stays aligned
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Product and Project Manager for Healthtech Startup
To freelancer:
5
Paym was very responsive and always showed to help out. Great on the phone and a nice person overall. We wish him the b…Paym was very responsive and always showed to help out. Great on the phone and a nice person overall. We wish him the best!
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Urgent Need: Elementor WordPress Developer to Implement Figma Design
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Sandeep has been a good developer -- we will continue with a fresh contract.
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5
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Scrum Master
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5
George was a solid and attentive pm for us. Ultimately not what we needed for the long term.
To client:
5
Aug 2025 - Oct 2025 80 hrs @ $23.16/hr Billed: $1,864.54
Long-Term Executive Assistant and Project Manager
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5
Incredible operations manager --
Oct 2024 - Oct 2025 1,305 hrs @ $17.23/hr Billed: $22,477.19
Enterprise SaaS Developer
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5
Mohamed has been the best CTO we could ever hope for in building our products. Would not hesitate to hire him again and …Mohamed has been the best CTO we could ever hope for in building our products. Would not hesitate to hire him again and again.
To client:
5
Great experience working on this project, thank you so much for this great opportunity
Apr 2025 - Oct 2025 FIXED $5,780.00
UX/UI Designer for B2B Website Redesign
To freelancer:
5
Fantastic designer and firm. They always produce high quality work and are a joy to collaborate with.
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5
Working with Ethan and his team was exceptional.We've had clear communication, great collaboration, and a truly professi…Working with Ethan and his team was exceptional.We've had clear communication, great collaboration, and a truly professional experience. Looking forward to new projects together!
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UX/UI Designer for B2B SaaS Platform
To freelancer:
5
One of the best design firms on Upwork -- always delivers ontime and is thoughtful with their work.
To client:
5
It’s been a real pleasure working together! They’re professional, organized, and make collaboration easy and enjoyable. …It’s been a real pleasure working together! They’re professional, organized, and make collaboration easy and enjoyable. Would be happy to work again on future projects!
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LLM and Langchain Langgraph Engineer for Healthcare
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5
Fantastic AI developer freelancer -- always responsive and thoughtful with high code quality.
To client:
5
Great client to work with! All expectations and requirements were communicated up front and the client was responsive to…Great client to work with! All expectations and requirements were communicated up front and the client was responsive to any of my requests for clarification.
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Salesforce Architect for ISV
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5
Terrific salesforce shop -- we will work with them again and again!
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Senior Django and Vue Full Stack Engineer
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5
Dang was terrific to work with and a true asset to our development team. Couldn't recommend enough.
To client:
5
Highly recommended!
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Product Manager with Healthcare Data - Scientific Literature Experience
Fantastic freelancer and team to work with -- cut through our Jira issues quickly and efficiently.
To client:
5
Great working with Ethan!
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Graphic Designer for Immediate Enterprise Branding Help
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5
Zaki was incredibly responsive and professional to work with. Hit major deadlines and put in after hours work to get ou…Zaki was incredibly responsive and professional to work with. Hit major deadlines and put in after hours work to get our designs completed to spec.
We unfortunately had to close out this contract because the drafts of policies were so far beyond usable they will requi…We unfortunately had to close out this contract because the drafts of policies were so far beyond usable they will require complete re-writes. Even as 'foundational' starting points, there were so riddled with confusing language, poor english, repetition of concepts (and not to mention 3 different misspellings of our company name) that we now don't even have time to work them out with the freelancer.
The billing was overall heavy, considering only a handful of policies were even delivered (that AI generated templates would have been an improvement on).
Jason i s a terrific and thoughtful engineer. I hope we can work together again soon .
To client:
5
Aug 2025 - Aug 2025 41 hrs @ $11.14/hr Billed: $451.24
Senior Django and Vue Full Stack Engineer
To freelancer:
5
To client:
5
Aug 2025 - Aug 2025 10 hrs @ $26.75/hr Billed: $267.49
Agile Project Manager for Healthtech Startup
To freelancer:
5
George has been a terrific person to work with. He jumped in immediately and help get our SDLC finalized while also mana…George has been a terrific person to work with. He jumped in immediately and help get our SDLC finalized while also managing our release cycle and setting up sprints.
To client:
5
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Senior Django and Vue Full Stack Engineer
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5
Great engineer, we just ran out of budget!
Aug 2025 - Aug 2025 8 hrs @ $42.62/hr Billed: $340.99
Django and Vue Full Stack Engineer
To freelancer:
4.4
Cullen is a very solid engineer, his style of communication and schedule were just not a fit for our team that expects c…Cullen is a very solid engineer, his style of communication and schedule were just not a fit for our team that expects consistent and detailed written comms. Thanks for the work!
To client:
5
Clear tasks, helpful at any time and I highly recommend
We had a great conversation and a clear understanding of the contract, but unfortunately our timelines didn’t align. Wis…We had a great conversation and a clear understanding of the contract, but unfortunately our timelines didn’t align. Wishing them success with the project ahead—it was a pleasure connecting.
Aug 2025 - Aug 2025 1 hrs @ $36.24/hr Billed: $18.12
Django and Vue Full Stack Engineer
No feedback given
To client:
5
Aug 2025 - Aug 2025 7 hrs @ $35.36/hr Billed: $247.54
Django and Vue Full Stack Engineer
To freelancer:
4.45
Muhammad did a good job considering the circumstances. Thank you for the work!
To client:
5
Working with Ethan and the team was an excellent experience!
I’d be happy to collaborate with them again in the future. …Working with Ethan and the team was an excellent experience!
I’d be happy to collaborate with them again in the future. Ethan is not only talented but also a pleasure to work with.
Ahmed was not what we were looking for unfortunately.
To client:
4.3
Ethan is a very good Person overall. We didn't have the chance to work for long time on this project. He quickly judged …Ethan is a very good Person overall. We didn't have the chance to work for long time on this project. He quickly judged that my work is done by AI based on a wrong information. However, I still appreciate his professional way.
May 2025 - May 2025 1 hrs @ $0.00/hr
LLM and Langchain Langgraph Engineer for Healthcare
To freelancer:
5
Harsh is a good engineer -- we enjoyed working with him but ultimately he wasn't a fit for our specific project.
LLM and Langchain Langgraph Engineer for Healthcare
To freelancer:
1.9
James did not honor his scoped estimate, worked over hours without notifying us, and then didn't preceded to tell me the…James did not honor his scoped estimate, worked over hours without notifying us, and then didn't preceded to tell me the work would take an undetermined amount of extra time. Code delivered was subpar and should have taken 1/5 the time allotted.
To client:
1
My experience working with this client was disappointing.
The initial contract (Monday, March 17) clearly specified 10-…My experience working with this client was disappointing.
The initial contract (Monday, March 17) clearly specified 10-12 hours to complete three specific tasks for the first phase:
- Implementation of PDF text extraction methods
- Development of basic extraction functionality
- Django framework integration
However, just one day after project initiation (Tuesday), the client provided a Notion document that significantly expanded the technical requirements:
- Added PDF coordinate positioning and highlight editing functionality
- Required implementation of 8 complex default extraction fields and a custom field system
- Introduced entirely new technical component requirements: LLM integration and Langchain prompt chain design
- Specified detailed testing with the "meta-llama/Llama-3.3-70B-Instruct-Turbo-Free" model
These new requirements weren't simple clarifications but introduced major functional modules not included in the original discussion, significantly increasing technical complexity and workload. After the requirements changed, I attempted to communicate with the client multiple times, but they repeatedly read messages without responding.
After completing the initially agreed-upon PDF processing module (MedicalPDFProcessor class), data model structure (schemas), and basic Django integration architecture, I professionally explained to the client that these expanded requirements exceeded the initial estimated workload and inquired how to handle the hour limitations to advance the project more effectively.
The client only responded with: "We disagree," then instructed me to "stop work immediately" and terminated the contract, completely ignoring payment issues for work already completed. Disturbingly, I also received a warning email from the Upwork platform indicating they had received negative feedback from the client, causing my JSS score to drop. This differs significantly from my understanding of our collaboration.
The practice of expecting numerous additional features without increasing budget or adjusting hours left me very confused and disappointed. The client's sudden contract termination and submission of negative feedback seriously impacted our professional relationship.
I advise other freelancers to be particularly cautious when working with this client. Ensure all requirement changes have clear written confirmation and corresponding hour adjustment agreements. Keep records of all communications and immediately discuss scope and budget adjustments when requirements change to avoid similar situations.
Here’s a clear outline of what I’m looking to build.
I’m looking for a solo full-stack developer to help me build a lean, owned web MVP for a season-long fantasy football game, that includes 2 tournament games in the season. This is not a full production platform and not a white-label solution — it’s a tightly scoped MVP to run one to three seasons and validate engagement.
Core requirements (must-have)
• Web app only (mobile-first, responsive)
• Email/password authentication
• Team creation (11 players, formation, captain)
• Weekly scoring (admin-controlled, not live data)
• Global season leaderboard
• Private mini-leagues with invite codes
• Mini-league leaderboards
• Basic league chat in mini league games
• Admin panel to:
• Update scores
• Edit scoring rules
• Manage players and leagues
• Lock/unlock matchweeks
Explicitly out of scope
• Live match data or Opta
• Payments or gambling features
• Native iOS / Android apps
• Push notifications
• Advanced analytics
• Official licensing or branding
Tech expectations
• Frontend: React or Next.js
• Backend: Node.js or Django
• Database: PostgreSQL
• Version control: GitHub (repo owned by me from day one)
• Simple, maintainable architecture (no over-engineering)
Budget & timeline
• Fixed budget: I am here to find out cost
• Timeline: 6–8 weeks but longer if needed
• Milestone-based payments of acceptable
If you
Get back to me please let me know.
1. How would you structure the database for users, teams, and leagues?
2. How would you handle weekly scoring updates in a clean way?
3. Have you built anything similar (games, dashboards, SaaS)? If so, please share.
4. Are you available consistently over the next 6–8 weeks?
I’m product-focused and will be closely involved, but I’m non-technical — so clear communication is important.
If this sounds like a good fit, I’m happy to move to the next step with you
We’re looking for an experienced n8n developer to build an automation workflow that enriches a large CSV dataset (thousands of rows) by filling missing fields using Apify scrapers and generating/rewriting content using OpenAI or Gemini APIs, then saving the final enriched data into our database.
This is a real production workflow (not a demo). We need clean architecture, good error handling, and reliable runs at scale.
What you’ll build
• Import a CSV (thousands of records) and iterate through rows safely (batching/rate limits).
• For each record:
• Detect missing fields and enrich using:
• Apify actors/scrapers (or built-in HTTP calls to Apify API)
• OpenAI API or Gemini API to generate structured content (based on our prompt rules)
• Normalize/validate output (schemas, required fields, formatting).
• Store results into our database (we’ll share DB type + schema: PostgreSQL/MySQL/Supabase/etc.).
• Add reliability features:
• Retries, timeouts, fallbacks
• Logging + run summaries
• Deduplication / “already processed” logic
• Checkpointing (resume if the run fails mid-way)
Required skills
• Strong hands-on experience with n8n (production workflows)
• Integrations: Apify, OpenAI/Gemini, HTTP APIs
• Data pipelines: CSV processing, batching, mapping, validation
• Database integration (Postgres/MySQL/Supabase/etc.)
• Experience with rate limiting, retries, and error handling in automations
Nice to have
• Experience with scraping best practices + data quality
• Familiarity with JSON schema validation and structured outputs
• Prior work on enrichment pipelines at scale
Deliverables
• Working n8n workflow(s) + documentation
• Environment variables setup (API keys, DB credentials, etc.)
• A short handover walkthrough (loom/video or call)
• Test run on a sample batch + final run plan for full dataset
Questions
1. Share 1–2 examples of n8n workflows you built (screenshots or description).
2. Have you integrated Apify inside n8n before? How?
4. What’s your approach to handling thousands of rows (rate limits + retries + resume)?
5. What database systems have you pushed data into via n8n?
Fixed budget:
500 USD
11 hours ago
Client's recent history (6 works)
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Thanks Lili for you efforts!
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Thank you
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I really enjoyed working with Aanchal. She’s an excellent developer, very committed, and handled the work on time.
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Very professional and easy to work with. Looking forward to more projects together.
