Best Java Jobs & Projects

About the Role

We’re looking for a Senior Software Engineer with deep expertise in AI platforms, data engineering, and machine learning infrastructure. You’ll design and build enterprise-scale systems that power intelligent applications, from LLM-driven products to high-throughput, cloud-native data platforms. This role suits an engineer who enjoys owning architecture end to end and turning ambitious AI ideas into reliable production systems.

Key Responsibilities
Design and build enterprise AI platforms that support LLM integration, retrieval-augmented generation (RAG), and generative AI applications
Architect scalable data platforms that ingest, process, and serve high-volume data (millions of records per month)
Build production ML infrastructure, including training pipelines, deployment automation, model monitoring, and governance
Develop secure, well-documented REST APIs and microservices in Python, Java, or TypeScript
Implement CI/CD workflows, containerization, and infrastructure-as-code
Tune distributed data pipelines for performance, reliability, and cost
Partner with data scientists, product managers, and engineers to deliver production-ready solutions

Required Skills & Experience

Core Technologies

Languages: Python, Java, or TypeScript/JavaScript
AI/ML: Generative AI, LLMs, RAG, prompt engineering, model deployment
Data Engineering: Spark, Kafka, ETL/ELT pipelines, advanced SQL
Cloud: AWS and/or Azure
DevOps & Infrastructure: Docker, Kubernetes, Terraform, CI/CD
Databases & Warehouses: PostgreSQL, MongoDB, Snowflake, Databricks, or similar

Experience & Communication

8+ years of professional software engineering experience
A proven track record of shipping AI/ML systems to production
Strong grasp of system design, scalability, and reliability
Experience building cloud-native applications
Comfortable working independently in a remote setting
Nice to Have
Hands-on experience with LLM platforms and frameworks (OpenAI, Azure OpenAI, Llama, LangChain, LlamaIndex)
Vector databases and semantic search
MLOps and ML platform development
Background in healthcare, fintech, or enterprise software
Kubernetes orchestration at scale
Microservices and distributed systems architecture
Master or PhD is a major plus
What We’re Looking For
Clear communicator and strong collaborator
Problem solver with a keen eye for detail
Proactive about asking questions and sharing progress
Enjoys mentoring junior engineers
Thrives in agile, fast-moving teams
Deliverables
Well-architected, production-ready code
Automated tests and CI/CD pipelines
Clear technical documentation and knowledge sharing
Regular progress updates and active collaboration

Job Title:
E-Commerce Developer Needed to Clone/Rebuild Minimalist Storefront (Shopify or WooCommerce) –
Job Description:
We are a newly registered Canadian spice import company looking for an experienced e-commerce developer to replicate and rebuild an existing website layout onto a fully automated storefront .
Our flagship brand, Just Pure Java Vanilla, connects premium, direct-from-source vanilla pods and pure vanilla powder from Surabaya, Indonesia, to commercial B2B buyers (craft breweries, micro-bakers) and direct consumers in the US, Canada, and Europe
The visual layout, product assets, and images are already live on a reference site (eternalvanillanusantara.com). We need a developer to clone that clean, minimalist aesthetic and build a robust, automated backend on either Shopify or WordPress/WooCommerce
Core Scope of Work:
1. Platform Rebuild: Replicate the front-end layout of the reference site onto a modern e-commerce framework . (Please state your preference for Shopify vs. WooCommerce in your proposal).
2. Domain Configuration: Point our flagship node (justpurejavavanilla.com) as the primary store, and set up a 301 Permanent Redirect for our regional domain (justpurejavavanilla.eu)
3. Please note : do not contact any emails or numbers on this site as it will confuse our staff over there .
4. Payment Gateway Integration: Securely connect the backend to our Canadian Stripe API Yet to be completed . Enable multi-currency display (USD and EUR), standard credit cards, Apple/Google Pay, and B2B bank payment rails (ACH/SEPA Direct Debit)
5. Automated Freight API: Integrate the DHL Express Developer API ( account yet to be established ) using our corporate account credentials so the checkout calculates live air-express shipping rates dynamically from Surabaya to the buyer's destination
6. Dual-Intent CTAs: Configure product pages to display a "Request Bulk Container Quotation" form for orders over 50 kg, alongside an automated "Buy 1kg – 10kg Online" checkout button for smaller wholesale lots
What We Provide:
• Full access to the public reference website layout and text copy.
• Clear product descriptions and specifications (already drafted)
• Fully documented Stripe and DHL Express corporate API credentials (when accounts completed ).
Requirements:
• Must be based in English with options on site to convert language.
• Proven track record building international e-commerce sites with automated shipping APIs
• Clean coding standards with a strong focus on page-load speeds and site security.
Please include links to 2 or 3 relevant e-commerce stores you have built in your proposal, along with a rough estimate of your timeline and costs

We are a growing software and IT services company providing end-to-end technology solutions to businesses across diverse industries. Our services cover the full software development lifecycle, from analysis and architecture to development, testing, deployment, maintenance, and support.

As we expand across the U.S., we are seeking a reliable and experienced Software Engineer who can contribute to technical planning, strategy, and business growth.

We are particularly interested in engaging reliable, dedicated, and passionate freelancers who are ready to take the next step in their careers by transitioning from freelance work to a stable, full-time position.

# Senior Flutter Developer – Mobile App Development

Location: Edmond, Oklahoma, United States (On-site)
Experience: 3+ Years
Employment Type: Full-Time / Contract
Education: Bachelor's Degree in Computer Science or a related field
Commercial: Contract and Payment only on Upwork

## Job Overview

We are looking for an experienced **Senior Flutter Developer** with strong hands-on expertise in Flutter and Dart to build, enhance, and maintain a suite of widely used, faith-based mobile applications.

The ideal candidate will have a proven track record of developing and shipping production-ready mobile applications for both iOS and Android. This role involves taking ownership of technical design decisions, establishing scalable app architecture, maintaining code quality, and collaborating with other engineers to deliver high-quality mobile experiences.

Candidates should be comfortable providing technical guidance, mentoring other developers, and exploring opportunities to integrate AI/ML capabilities into mobile applications.

**Important:** This is an on-site opportunity in Edmond, Oklahoma. Candidates must be able to work on-site full-time and demonstrate alignment with the organization's faith-based mission.

## Key Responsibilities

- Design, develop, and maintain cross-platform mobile applications using Flutter and Dart for iOS and Android.
- Take ownership of technical design decisions, including application architecture, state management, and development approaches.
- Evaluate technical trade-offs and communicate architectural decisions clearly.
- Review, test, and approve code to ensure quality, consistency, and maintainability.
- Collaborate with engineers to establish technical approaches and development plans.
- Provide technical guidance and mentorship to junior and mid-level developers.
- Help maintain consistent technical standards and direction across the development team.
- Troubleshoot and resolve complex technical issues, including platform-specific iOS and Android behavior.
- Identify opportunities to improve development workflows, tools, and engineering practices.
- Explore and implement AI/ML capabilities to enhance mobile application experiences.

## Mandatory Requirements

- Minimum 3 years of mobile application development experience.
- Strong hands-on expertise in Flutter and Dart.
- Proven experience developing, launching, and maintaining production Flutter applications on the Apple App Store and Google Play Store.
- Strong understanding of Flutter architecture, state management, and mobile application testing.
- Experience making technical decisions and evaluating architectural trade-offs.
- Ability to guide and support other engineers without formal managerial authority.
- Strong communication skills and the ability to explain complex technical concepts clearly.
- Self-motivated, proactive, and capable of taking ownership of assigned projects.
- Bachelor's degree in Computer Science or a related field.
- Alignment with the organization's faith-based mission and willingness to uphold its beliefs.

## Nice to Have

- Experience with native iOS development using Swift.
- Experience with native Android development using Kotlin or Java.
- Experience implementing Flutter platform channels.
- Familiarity with AI-assisted development tools.
- Experience integrating AI/ML capabilities into mobile applications.
- Previous experience mentoring developers or leading technical design for large-scale consumer applications.

## Location & Work Arrangement

This is an **on-site position in Edmond, Oklahoma, United States**.

Candidates must be able to work on-site full-time. Remote-only applicants are not eligible for this opportunity.

## Application Requirements

Interested candidates should submit an updated CV or resume without personal contact information.

Please highlight the following in your application:

- Your hands-on Flutter and Dart experience.
- Production mobile applications you have successfully launched on the App Store or Google Play.
- Your experience with mobile architecture and state management.
- Your current location and ability to work on-site in Edmond, Oklahoma.
- Your availability and notice period.
- Your alignment with the organization's faith-based mission.

**Important:** Strong practical Flutter/Dart expertise, production app experience, on-site availability, and alignment with the organization's faith-based mission are essential requirements for this opportunity.

You will build agent environments from the real operating records of US businesses: dealerships, logistics firms, service companies. Most environments are built on invented tasks. Ours start from real work with real outcomes, such as a repair order, what the technician actually found, and whether the car came back.

Vellum licenses de-identified business records on behalf of the companies that create them. You would be our first engineer dedicated to turning those records into sandboxes, tasks and graders that AI developers train and evaluate agents on.

We're a growing software development agency with several great project managers already on board, but business has been picking up faster than our calendars can keep up, so we're looking for another technically sharp, client-facing PM to join the team.

This isn't your typical project management role where you spend all day moving tickets around Jira, we need someone who can confidently lead client discovery calls, handle technical interviews, discuss project requirements, and make clients feel they're talking to someone who actually knows how the code works. You should have solid hands-on experience with React, Python, AI/LLM integrations, automation workflows, APIs, and GitHub, with enough technical depth to discuss architecture, troubleshoot challenges, estimate development effort, and answer unexpected technical questions without breaking a sweat. You'll primarily represent our agency during client interviews and technical meetings, translate business ideas into clear development plans, and coordinate with our internal developers and existing PMs to keep everyone on the same page. Excellent spoken English, natural communication, quick thinking, and availability during US business hours are essential, because clients don't always follow a script, and neither should you. We're especially interested in someone who's worked as a senior developer, technical lead, or technical PM and genuinely enjoys talking to clients as much as solving technical problems. Our starting budget is $50–$60 per hour, but we're flexible for someone who demonstrates exceptional technical knowledge, strong client communication, and the ability to help us win and manage projects.

If you can explain a complicated AI workflow in plain English, handle a surprise GitHub question, and leave a client thinking, "Yep, this person knows their stuff," we'd love to hear from you, tell us about your technical background, client-facing experience, and availability for a quick introductory call.

I need back-end development for a video game in Unity 3D. It's a requirement that you have done back-end development for a Unity 3D client game before. You will need to be able to work with Steamworks, Spring Boot and AWS. Please explain your role and the architecture you used.

This task includes some feature design, some Unity 3D client work and mostly back-end work.

We are going to use AWS for our backend with ECS.

We need to code/design/implement a headless Unity build of our game as a container, put it into ECS.

We also need a containerized java spring boot backend server that has integration to Steamworks, tracks games/lobbies, has leaderboard/ladder functionality and talks to the headless Unity game containers in ECS.
It will write to Postgres server in AWS and / or Dynamo DB.

You will also need to design version update and release processes for the headless builds as well as the main server so that we can update with minimal downtime and handle client mismatches. The solution would also have to be auto-scalable.

Some of the scaffolding is already done (Java Spring Boot server with some steamworks integration, Unity 3D client with some steamworks integration and libraries/hookup to talk to the Java server).

The game is a deterministic trading card game with auto battles. If there is bugs with determinism that is out of scope, but everything else regarding the back-end hookup is in scope.

Unity 3D Client - Send game actions to server, including game actions of the actual simulation as well as creating lobbies/joining games/leaving games. Our unity game already has some steamworks setup but you would need to implement player chat to friends and inviting friends into games.

Unity 3D Headless - Create headless build design and server setup so that in 'Server mode' the headless build can act like a server and take pre-determined amount of simulations and manage them. Will require some design/coding/hookup into existing simulation. You will need to implement the simulation manager portion of the headless server and manage players/teams/multiple simulations per server. Between the client and the headless client, users should be able to send in-game messages to the lobby, their friends, or teammates separately.

Java Spring Boot Server - Orchestrate/track/sever state/connections between unity 3d client and their headless counterpart. Record game results / ladder rankings. Create / join lobbies via steamworks. User account management (forgot password) etc. Account mapping from internal game user to steamworks user.

Load balancing setup in AWS - Ensure each unity client traffic is routed to the proper headless unity headless client that is managing its online game. Ensure headless client containers are scalable as well as the java backend.

Solution should be secure, and come with a release / version update plan.

Milestones:
1) Full Back-End Design including release plan for new version
2) Java spring server coding / feature implementation / setup in AWS
3) Unity client and Unity headless server code setup / implementation / setup in AWS

Applicants should have at least 5 years professional software experience or equivalent. I would expect AI coding tools could be used to aid software development and design but only when used by an experience professional.

Our total budget for this cannot exceed $5500 USD. This is part of a grant application and is being planned for Feb 2027.

I need a developer to help build a bot for an established game using native development. The project includes creating a spoofer and supporting the transition from Java to native. I’m looking for someone who can work independently, communicate clearly, and deliver a reliable solution. Please share relevant experience with game-related projects and similar bot development work.

We're a software agency that builds web apps and SaaS products for clients around the world. We need an experienced software professional to join our client video calls and speak for our technical team.

WHAT YOU WILL DO
- Join scheduled Google Meet calls with our existing clients
- Give project updates and explain technical details in plain language
- Answer client questions using the briefing we send you
- After each call, send us a short summary with client feedback and action items

WHAT YOU WILL NOT DO
- No coding
- No sales or finding new clients

HOW IT WORKS
Before every call, we send you the project status, the agenda, and key talking points. You review them, join the call, and report back to us. If a client asks something you can't answer, you tell them we'll follow up and pass the question to our team.

REQUIREMENTS
- 7+ years in software engineering, architecture, tech leadership, or IT consulting
- Fluent spoken English
- Good knowledge of web development and SaaS products
- Able to explain technical topics to non-technical people
- Webcam, stable internet, and a quiet place for video calls
- Always on time and prepared

NICE TO HAVE
- Experience as a tech lead, architect, or consultant
- Experience talking directly with clients
- Master's degree or PhD in Computer Science, Software Engineering, or a related field

DETAILS
- Fully remote
- Calls are booked in advance, with no fixed hours or minimum
- Mostly during US time zone
- Ongoing work for the right person

TO APPLY
Please answer the screening questions below.

We're looking for an experienced AI evaluation specialist for a remote contract evaluating AI coding agents in terminal-based environments.

What you'll do:

- Evaluate AI-generated solutions to coding, debugging and sysadmin tasks in the command line
- Run test suites, investigate failed executions, and tell genuine solution errors apart from environment issues
- Review task instructions, expected outcomes and test reliability
- Write clear, evidence-based, reproducible findings

Must have:

- Hands-on experience with Terminal-Bench or similar coding-agent evaluation work (Outlier, Mercor or comparable AI training platforms)
- Strong Linux, Git, command-line and scripting skills
- Proficiency in Python (JavaScript, Java or C++ a plus)
- Experience with Docker, test harnesses and automated grading
- Excellent written English

To apply, please include:

1. The AI evaluation platforms and project types you've worked on (no confidential details)
2. Your specific Terminal-Bench or terminal-agent evaluation experience
3. Your programming languages and dev environment
4. Your availability and best hourly rate

Shortlisted candidates may be asked to complete a short practical assessment.

# Senior Ruby on Rails Engineer for Production Applications

We’re looking for an experienced Ruby on Rails engineer to build and support production applications at enterprise scale. You’ll own features from design through release, working closely with product, QA, and platform teams.

## What you’ll do

- Design, build, test, and maintain Rails features and backend services.
- Design and integrate RESTful APIs.
- Model relational data and improve ActiveRecord and SQL query performance.
- Troubleshoot production issues and help keep applications reliable.
- Participate in code reviews and CI/CD delivery workflows.
- Collaborate across the full product delivery cycle.

## Required qualifications

- Strong, hands-on Ruby on Rails experience supporting production applications.
- Solid Ruby fundamentals and familiarity with Rails conventions.
- Experience designing, developing, and integrating REST APIs.
- Practical relational database experience, including schema design, ActiveRecord, and SQL tuning.
- Automated testing experience with RSpec or Minitest.
- Comfortable with Git, code review, and CI/CD workflows.
- Bachelor’s degree in Computer Science or equivalent practical experience.

## Nice to have

Experience with one or more of the following:

- Go (Golang) backend services or Java enterprise and microservices development.
- Sidekiq or Resque.
- Docker or Kubernetes.
- AWS, GCP, or Azure.
- Redis or Elasticsearch.

##Services preferably required in Austin, TX

## To apply

Please include:

1. A brief summary of your production Rails experience, including the types of applications you’ve supported.
2. One example of a Rails feature, API, or performance issue you handled, and your role in the work.
3. The testing tools and deployment workflows you’ve used.
4. Any experience with the nice-to-have technologies listed above.

I am looking for job opportunities in programming and would like to be hired for projects involving website and application development. I have experience working with Java, Python, C++, and HTML, and I am comfortable building both web-based and desktop applications. I am seeking a role where I can contribute to development tasks and help deliver software solutions.

I need a developer to build a trading bot for me. The project involves creating a reliable and efficient bot that can execute trades based on predefined strategies. Experience with trading systems and automation is important. Please share relevant examples of similar projects and your approach to building and testing the bot.

We are seeking a skilled freelancer to restore a Docker version of CM14.2, which is a legacy system of Oracle Primavera Contract Manager version 14.2. The ideal candidate will have extensive experience with Docker containers, and a solid understanding of Oracle Primavera applications. You will be responsible for ensuring the application runs smoothly in a Docker environment and troubleshooting any issues that arise. If you have a passion for containerization and legacy systems,

Detailed SOW:
Containerize “Oracle-Primavera Contract Manager ver 14.2” , CM14.2 is running in a Virtual Server (Centos 7) at ServerPoint.com
1) Dockerization to move the CM14.2 from ServerPoint.com to the dedicated server at OVH.ca
2) Set up master backup of CM14.2 (to recover from a hacker attack, not the data)
Note: No changes to the CM14.2 are required or desired

Preliminary phase:
a) Consultant must review dedicated server configuration of CM14.1 and solve the problem on why CM14.1 (docker version) is not accessing correctly the database of BIP (forms and report)
b) Migrate Correct BIP database on the VPS at ServerPoint to CM14.1 (docker version) at OVH
c) Create a Windows 7/SP1 with java to access CM14.1 and CM14.2, or explore alternatives
The Preliminary phase will be at $25 not to exceed $100

Hello, I have existing digital screens in Orlando, Florida running Optisigns. I am looking for a company to manage the content on my screens, including uploading images and videos, creating promotional content and scheduling what appears on each screen I want to keep my existing screens and Opti Sign software do you provide the service and do you have experience working directly with OptiSigns?

Freelance Website Developer & Maintenance Specialist
ChatterBox Creative | Remote | Contract / Part-Time

ChatterBox Creative is looking for a dependable website professional to help manage, maintain, and troubleshoot our clients’ websites. We need someone who can handle ongoing technical care, resolve issues, and help keep websites current, secure, and functioning properly.

This is an ongoing freelance opportunity with hours based on client needs. We’re looking for a long-term partner who communicates clearly, takes initiative, and follows through.

What You’ll Do

Maintain client websites, primarily WordPress, with occasional work in Wix, Webflow, or other platforms.

Manage WordPress core, plugin, theme, and PHP updates, checking compatibility and testing functionality.

Troubleshoot website outages, database connection errors, plugin conflicts, broken pages, and performance issues.

Set up and monitor backups, verify recovery options, and restore websites when needed.

Monitor security alerts and address vulnerabilities, malware, and unauthorized changes.

Manage hosting configurations, SSL certificates, domains, DNS records, and website migrations.

Coordinate with hosting providers and other vendors to resolve technical issues.

Make content updates and minor design or functionality improvements.

Test forms, appointment links, mobile layouts, and other important website features.

Maintain clear records of access, configurations, renewals, maintenance, and completed work.

Flag outdated websites and recommend practical options for repair, improvement, or rebuilding.

What We’re Looking For

Demonstrated experience maintaining and troubleshooting business websites.

Strong WordPress skills, including PHP, MySQL databases, HTML, CSS, and working knowledge of JavaScript.

Experience with hosting control panels, SFTP/SSH, phpMyAdmin, backups, and staging environments.

Understanding of DNS and domain management, including how website changes can affect business email.

Experience investigating compromised websites and improving website security.

A careful approach to changes, including backups, testing, and a recovery plan.

Ability to explain technical issues in plain language and provide realistic estimates.

Reliable communication, attention to detail, and availability for occasional urgent issues.

Willingness to work behind the scenes as part of the ChatterBox Creative team and protect confidential client information.

Helpful Experience

Supporting multiple websites for an agency or freelance client roster.

Working with Liquid Web, GoDaddy, and other hosting and domain providers.

Maintaining older websites with compatibility challenges.

Website accessibility, technical SEO, and speed optimization.

Building or redesigning websites when maintenance is no longer the best solution.

Working Arrangement

This is a remote, independent contractor role with recurring maintenance work and additional projects as needed. Please share your hourly rate, any monthly maintenance pricing, typical availability, and response times for urgent issues.

Work that exceeds the approved scope or budget must be discussed before proceeding.

We are a growing software IT services company. We provide IT services across various technology platforms for businesses of all sizes and industries.

Our expertise covers the entire software development lifecycle, including analysis, design, development, testing, integration, deployment, operations, maintenance, and support.

We are looking for a talented software engineer who can contribute to technical planning, formulating strategies.

Existing World of Warships tactical intelligence PoC into a reliable Windows desktop application.

The main technical scope is:
C# / .NET for the core Windows runtime and application logic
WinUI 3 or WPF with WebView2 for the desktop shell
TypeScript / HTML / CSS for the UI
Local data handling with SQLite
REST/API integration and backend connectivity
Installer, updater, logging and crash handling
Reliable operation across different Windows PC configurations
Migration of useful logic from the current PowerShell / JavaScript PoC without unnecessary rewrites

Need a freelancer to help implement Busy21 software and update back-dated data accurately. The work includes setting up the system, importing historical records, and ensuring data is entered correctly so it aligns with existing business processes. Experience with similar accounting or business software is important. Please share relevant examples of past work and your approach to handling data migration and implementation tasks.

I am an independent enterprise payroll and HCM consultant. I have proven, hardcoded prompt logic that currently runs inside ChatGPT Custom GPTs. I need a developer to transition these prompts into a secure, private cloud-hosted web application so my corporate clients can securely upload files and view automated compliance audit reports.

We need an expert developer to create and implement Android extensions for our app(it's basically related to x Twitter). The work includes building custom features, integrating functionality, and ensuring smooth performance across devices. You should be able to deliver reliable, scalable solutions and collaborate closely with our team throughout the project. Experience with Android app development and extension-based workflows is important for success in this role.

Technical Project Manager – AI Automation & Software Development

Remote | Part-Time / Ad Hoc | Long-Term Opportunity

IMPORTANT: Excellent spoken and written English is essential. You must be confident independently leading meetings with UK clients. AI-generated, generic or copy-and-paste proposals will not be reviewed.

About Opten Group

Opten Group is a UK-based AI automation and software development company established in January 2026.

We’re a small, growing team currently supporting three clients with bespoke AI automation and software integration projects.

As founders, we currently manage most client communication, technical requirements and coordination with our outsourced developers. We’re looking for someone to take ownership of these responsibilities, allowing us to focus on growing the business.

The Role

We’re seeking a technically knowledgeable Project Manager who can operate as an extension of the Opten team, representing our company directly in client meetings.

You’ll act as the bridge between our clients and outsourced developers, helping identify automation opportunities, scope requirements, coordinate development and manage delivery.

This is a flexible, ongoing position, with work allocated as required rather than a fixed full-time commitment.

Key Responsibilities

* Client meetings: Independently lead meetings with clients and their technical teams, representing Opten professionally.
* Technical scoping: Understand existing business processes, identify opportunities for AI automation and translate requirements into clear development briefs.
* Developer coordination: Work directly with our outsourced developers, managing priorities, progress, technical questions and delivery.
* Client communication: Provide regular updates, manage expectations and act as the main point of contact for technical queries.
* Technical support: Understand our existing applications, AWS infrastructure and codebases to assist with troubleshooting, testing and smaller changes when required.
* Project ownership: Track outstanding actions, follow up on deliverables and ensure work progresses without constant involvement from the founders.

Essential Requirements

* Excellent spoken and written English — non-negotiable.
* Confident leading client meetings independently.
* Previous experience managing technical software development or AI automation projects.
* Strong understanding of APIs, system integrations, software development and cloud infrastructure.
* Ability to scope technical requirements and communicate them effectively to developers.
* Proactive, organised and comfortable working independently.
* Availability during UK business hours for client meetings.

Desirable: AWS, Python, JavaScript/TypeScript, AI/LLM integrations, workflow automation and hands-on troubleshooting experience.

Working Arrangement

We’re looking for a long-term working relationship with an individual freelancer, not an agency.

The position will initially be part-time and ad hoc, based on client requirements, scheduled meetings and technical support needs. There is potential for the role to grow as Opten expands.

How to Apply

Please briefly explain:

1. Your experience leading technical client meetings and managing outsourced developers.
2. Your understanding of AI automation, APIs and cloud-hosted applications.
3. Whether you’re comfortable representing Opten directly in client meetings and independently managing technical delivery.
4. Your hourly rate and availability during UK working hours.

Please submit a personal response based on your own experience. AI-generated proposals will not be considered.

Dear Stibo Developers,

We are currently looking for additional Stibo Developers for one of the leading tech companies in Germany. The position is 100% remote and long-term.

QUICK FACTS:
- Freelancing/Contracting
- Start: ASAP
- 100% remote
- Duration: long-term 12+ months
- Capacity: full-time, part-time also possible
- Language: German
- German business hours

REQUIREMENTS:
- Experience working with Stibo Systems, ideally Stibo STEP, in enterprise data management projects.
- Hands-on experience with Stibo STEP development, including configuration, extensions, and integrations.
- Solid knowledge of Java for custom development within the Stibo environment.
- Background in solution consulting, translating business requirements into Stibo-based solutions.
- Familiarity with PIM/MDM concepts, data models, and integration patterns.
- Fluent German, spoken and written.

Are you interested?

If so, please send us your proposal including your most recent CV as well as your earliest possible starting date.
When sending over your details, please include a self-assessment (0-10, 10 = expert level) in the following areas:
- Stibo (in general)
- Stibo STEP hands-on development
- Stibo STEP integrations
- Java
- Stibo solution consulting
- PIM/MDM data modelling
- Other MDM systems you are familiar with (please list and rate yourself)

We are looking forward to hearing back from you. Have a great day!

Your wynwood tech Recruiting Team ;-)

Hiring, Senior Java Developer
Job Description
Catalight Foundation is seeking a Senior Java Developer with current, hands-on Spring
Boot experience. This person will work full-time on a staff augmentation basis, reporting to
the Senior Software Architect. The technical stack below outlines the expected skills.
Technical Stack
Platform: AWS, Kubernetes, Terraform
Backend: Java, Spring Boot, Spring Data, Spring REST, Swagger, Postman
Database: Relational databases, SQL, transactions
Unit Testing: JUnit 5, REST Assured
QA: Manual UI testing, automated backend testing
UI: React, TypeScript
Observability: Datadog
Schedule
Project dates: November 1, 2026 – March 1, 2027
All team members are expected to be available during U.S. working hours for daily stand-up
meetings, sprint planning, demos, retrospectives, escalations, production deployments,
and other Agile ceremonies.
Outside these commitments, team members may work during their local business hours,
with daily code check-ins and reviews.
The team will follow a weekly sprint cadence.

The main work includes Luau scripting, player progression, DataStore saving, pet and inventory systems, currency, upgrades, rewards, and mobile-friendly UI.

We want the systems to work reliably in multiplayer and save player progress correctly.

We’re looking for an Integration Tester with hands-on experience in API and integration testing, particularly using the Karate framework, across web and mobile applications.

Key Requirements:
- Strong understanding of SDLC, STLC, and Agile methodologies.
- Hands-on experience with Karate framework for API and integration testing.
- Experience testing REST/SOAP APIs using Karate, Postman, or SoapUI.
- Ability to design and maintain automated test scripts, test cases, and test reports.
- Working knowledge of SQL Server and/or Cosmos DB.
- Strong analytical, problem-solving, and communication skills.
- Ability to collaborate with developers and business stakeholders.

Nice to Have:
- Basic knowledge of Java and JavaScript.
- Familiarity with JMeter, Jenkins, Bitbucket, JIRA, Confluence, and CI/CD pipelines.

To Apply
Please share your resume (with contact details removed) along with your availability:
- Full-time availability
- Earliest starting date

We’re looking for a Senior Integration Developer with 8+ years of experience in enterprise integrations, Apache Camel, Java/Groovy, Spring Boot, and Azure.

Key Requirements
- 8+ years of integration development experience.
- Strong hands-on experience with Apache Camel, Java/Groovy, and Spring Boot.
- Experience with Azure services, especially Container Apps, Container Registry, Service Bus, Key Vault, and API Management.
- Strong knowledge of microservices, REST APIs, Docker, and SQL.
- Experience with JUnit 5, automated testing, and CI/CD pipelines.
- Good problem-solving and communication skills.

Nice to Have
- Experience with Dynatrace, Splunk, or other integration platforms.
- Azure/Java certifications and Agile experience.

To Apply
Please share your latest resume (with CONTACT DETAILS REMOVED) along with your availability:
- Full-time availability
- Earliest starting date

I'm looking for an experienced Data Platform Engineer for a short, focused project to troubleshoot and improve an existing Python and Airflow data pipeline running on AWS.

The pipeline ingests data from external APIs into PostgreSQL, but we're seeing occasional duplicate records during retries and inconsistent results from incremental loads.

Scope of Work
- Review the existing Airflow DAG and Python ingestion logic.
- Identify and fix the cause of duplicate records during retries.
- Improve incremental loading to prevent missing or repeated data.
- Add basic validation and error logging.
- Test the fixes and provide a brief summary of changes.

Required Experience
- Strong Python, SQL, and PostgreSQL skills.
- Hands-on experience with Apache Airflow.
- Experience troubleshooting production ETL/ELT pipelines.
- Familiarity with AWS and reliable data processing practices.

Project Details

This is a small, short-term engagement focused on one existing pipeline, not a full platform rebuild. The expected deliverable is a tested fix with a brief technical handoff.

Please share your experience with similar pipeline issues and your availability to start.

Summary

Location: Brussels, Brabant, Belgium
Work Mode: On-site
Employment Type: Full-time
Experience: 8+ Years
Education: Bachelor’s or Master’s degree in IT, Computer Science, Engineering, or equivalent
Language: Fluent in French or Dutch (mandatory)

About the Opportunity

We are seeking a Test Automation Specialist fluent in French or Dutch to join our team in Brussels. You will lead test automation initiatives across UI and API layers, leveraging modern frameworks and AI‑driven testing approaches.

Key responsibilities

- Review acceptance criteria and create comprehensive test plans and estimates.
- Design, develop, and maintain automated UI and API test scripts using Playwright, TypeScript, Groovy and ReadyAPI.
- Execute automated test suites, analyze results, and report defects efficiently.
- Collaborate with Agile teams, participating in sprint planning and daily stand‑ups.
- Apply AI prompting techniques to enhance test case design and script generation.
- Maintain test artefacts in version control (Git) and ensure integration with CI pipelines.

Required qualifications:

- Minimum 7 years of experience in software testing and test automation.
- Strong expertise in UI and API automation, particularly with Playwright and ReadyAPI.
- Proficient in TypeScript, Groovy, and Git.
- Experience testing REST, web, Java, and proxy services.
- Understanding of Agile methodologies and QA best practices.

Nice to have:

- Experience with AI‑driven testing and prompt engineering.
- Familiarity with Jira, Confluence, and Xray.
- Knowledge of cloud‑based testing environments.
- Exposure to cybersecurity testing concepts.

We are looking for an experienced FiveM mapping developer to convert, merge, repair, and optimize our existing YMAPs and related assets for FiveM Enhanced.

The work includes asset conversion, resource organization, conflict resolution, collision and texture fixes, LOD optimization, and compatibility testing. A working GTA V Enhanced installation, FiveM Enhanced test server, CodeWalker, and required conversion tools are mandatory.

**In-game testing of every map location is required.** Please apply only if you have hands-on experience with FiveM Enhanced mapping and can provide tested, installation-ready resources with documentation.

Please include your relevant experience, available tools, and estimated timeline for an initial qualification batch and the full project.

Senior Program Test Lead – French or Dutch Speaker (Brussels, Belgium)

Summary

Location: Brussels, Belgium
Work Mode: On-site
Employment Type: Full-time
Experience: 8+ Years in testing, including large-scale test program leadership
Education: Bachelor’s Degree
Language: Native or fluent French or Dutch (mandatory) and professional English

About the Opportunity
The successful candidate will orchestrate testing across multiple workstreams of a large transformation program in Brussels, own the program test plan, and coordinate internal teams and suppliers. This role requires strong, hands-on test program leadership and governance expertise, and fluent French or Dutch.

Key Responsibilities

-Develop the overall program test plan and break it down into integrated operational plans.
-Orchestrate testing activities carried out by multiple workstreams, internal teams and suppliers.
-Build and maintain a consolidated schedule of test campaigns, dependencies, environments, datasets and resources.
-Coordinate the sequencing of System Testing, SIT, End-to-End, UAT, regression and non-functional tests.
-Anticipate capacity conflicts, critical dependencies and cross-domain impacts, and propose the necessary trade-offs.
-Produce consolidated dashboards on coverage, results, risks and quality of evidence for governance decisions.
-Apply risk-based testing and maintain a traceability framework from requirements to test evidence.
-Report to senior stakeholders and governance bodies, providing clear end-to-end visibility of quality, coverage and risk.

Mandatory Requirements

-Minimum 8 years of experience in testing.
-Proven experience leading large-scale, multi-workstream testing programs.
-Strong knowledge of System, SIT, E2E, UAT and regression testing methodologies.
-Ability to build and maintain comprehensive test plans and schedules.
-Experience with test governance, risk-based testing, traceability, and reporting to senior stakeholders.
-Excellent communication and stakeholder coordination skills, including supplier management.
-Bachelor’s degree.
-Native or fluent French or Dutch, spoken and written, plus professional English.

Nice to Have

Experience coordinating testing with third-party platform vendors and their delivery processes.
Experience with migration validation and cut-over planning.
Experience with non-functional testing coordination (performance, security, resilience).
Background in large transformation programs.

Location Requirement: This is an on-site role in Brussels, Belgium; candidates must be able to work on-site with a French- or Dutch-speaking team.

Important: Strong practical experience leading large-scale test programs and fluent French or Dutch are essential. Candidates must meet both requirements to be considered.

📩 Interested? Apply with your updated CV in English (no contact information), highlighting your test program leadership and governance experience, your language levels (French, Dutch, English), current location, and availability or notice period.