Best Java Jobs & Projects

Looking for a no-code/full-stack developer to help build a lightweight web app using the following tools:
• Lovable for front-end page building and logic
• Supabase for database, auth, and file storage
• Stripe for handling small one-time user payments

You should be experienced in:
• Creating multi-screen flows in Lovable
• Setting up user authentication and roles in Supabase
• Connecting Stripe to trigger payments before database actions
• (Bonus) Experience with API integrations or matchmaking logic

This is for an MVP build with a quick turnaround.
Please share 1–2 past projects using similar stacks.

Looking for Automation Expert to Build AI-Based Wellbeing Assessment with GPT-4 Report

I'm looking for an experienced automation expert to help me build a cutting-edge, AI-powered Wellbeing Self-Assessment.

The goal is to create an online self-assessment covering 5 key areas of wellbeing (mental, emotional, physical, financial, and spiritual wellbeing), which generates a personalized report automatically using GPT-4, and allows users to book a 1:1 coaching session afterward.

Tools: Typeform or ScoreApp + Make.com (or Zapier) + OpenAI API / or equal
Requirements: API fluency, GPT integration, experience with automation workflows and lead generation funnels

Please include a portfolio or example of previous work related to:

Automation with GPT or OpenAI

Personalized report generation

Online assessments or health/coaching funnels

I am looking for some expert how teach me SQLTDD, I know SQL in details, I know JAVA, I know Junit to do TDD in Java.
Now want to learn SQL TDD.
If some one can help me with that

Job Description:
We seek an experienced software developer with expertise in PHP and Artificial Intelligence (AI) to join our team. The ideal candidate will have a strong background in designing, developing, and implementing AI systems that utilize big data, machine learning algorithms, and deep learning frameworks. Your work will focus on creating intelligent software solutions capable of learning and adapting to new situations and integrating AI functionalities with PHP-based applications.

Key Responsibilities:

1. AI Development:

Design, train, and optimize machine learning models for specific tasks, such as natural language processing, predictive analytics, or image recognition.

Select appropriate AI algorithms based on problem domain and data characteristics.

Stay updated on advancements in AI and propose innovative solutions to complex problems.

2. Big Data Management:

Collect, clean, and preprocess large datasets for machine learning model training.

Perform data transformation and feature engineering to enhance model performance.

3. Application Integration:

Integrate AI models into PHP-based software applications.

Deploy models on cloud platforms or on-premise infrastructure.

4. Model Evaluation and Iteration:

Evaluate the performance of AI models using metrics such as accuracy, precision, recall, and F1-score.

Identify and implement areas for improvement in AI models and software systems.

Technical Skills Required:
• Programming Languages: PHP, Python (TensorFlow, PyTorch, scikit-learn), Java, or C++
• AI/ML Frameworks: TensorFlow, PyTorch, Keras
• Big Data Tools: Pandas, NumPy, SQL
• Cloud Computing Platforms: AWS, Azure, or GCP
• Version Control: Git
Soft Skills:
• Strong problem-solving and critical thinking skills.
• Excellent communication skills for collaborating with cross-functional teams and explaining technical concepts to non-technical stakeholders.
• Adaptability to quickly learn and implement new technologies.

• Describe your recent experience with similar projects
• Include a link to your GitHub profile and/or website
• Please list any certifications related to this project

We are seeking an experienced developer with a strong background in Android TV streaming applications. The ideal candidate will have the ability to create, maintain, and enhance streaming functionality, ensuring optimal performance and user experience. Familiarity with media playback, content delivery networks (CDNs), and user interface design is essential. If you are passionate about developing high-quality streaming applications for Android TV, we would love to hear from you!

We’re seeking a skilled Full Stack developer to help improve and optimize an existing React-based web application. The project is functional, but we need someone to elevate the code quality, performance, user experience, and structure. You’ll be working on refining existing components, implementing new features, and suggesting architectural improvements.

We are seeking an experienced developer to conduct a thorough review of our existing codebase. The focus will be on assessing its performance, seamlessness, flow, reliability, scalability, and speed. Your insights will help enhance the current project being developed by another team member. If you have a keen eye for detail and a strong background in optimizing code, we would love to hear from you. This is an opportunity to contribute to the success of our project by ensuring it meets high standards of quality and efficiency.

The task is to troubleshoot the attached javafx code so that the pnm remote content appears inside the swing jframe. All that you need will be provided promptly.

We are seeking an experienced engineer with expertise in Hyperledger Fabric, Typescript, and .NET to assist in migrating a project from an Ethereum Virtual Machine (EVM) environment to a Hyperledger Fabric framework. The ideal candidate will have a strong understanding of both blockchain technologies and the nuances involved in the migration process. If you have a proven track record in implementing Hyperledger solutions and are skilled in Typescript and .NET, we would love to hear from you.

We are seeking a talented mobile developer to create a chat insight application utilizing OpenAI technology. The app will feature tone-based reply suggestions to enhance user interactions and should prioritize a simple, user-friendly interface. The ideal candidate will bring experience in mobile app development, familiarity with AI integrations, and a strong understanding of UX principles. This project aims to deliver an innovative solution that improves communication through intelligent responses.

Note: This job is part of a discovery phase. I’m exploring options and evaluating timelines, tech stacks, and developer fit before proceeding.

• What platform would you use to build this MVP and why?
• Describe your recent experience with similar projects
• Include a link to your GitHub profile and/or website
• What frameworks have you worked with?

We are looking for a skilled developer to integrate Ezyvet with Gmail through API programming. The ideal candidate should have experience working with both platforms, enabling seamless communication and data transfer between them. Your role will involve creating and managing API connections, ensuring data integrity, and troubleshooting any issues that arise. If you have a strong background in API development and are adept at working with Ezyvet and Gmail, we would love to hear from you.

we would just want it to sync back and forth with Ezyvet.
Be able to send Gmails from Ezyvet
Use our email addresses as the sending address rather than noreply@ezyvet
Document the emails in and out within ezyvet and obviously within Gmail
All logged in the communications tabs eg

I have a pos system i sale to restaurant owners i am looking to get uber eats and door dash api's added to my pos system so my customers could recieve there orders all in 1 system so they need to have 3-4 tablets

Need someone to transform an XML file, simple renaming according to my requirement. Also, need would need you to show me how to do it myself in the future.

We are seeking a skilled developer to assist in building a model context protocol server. The ideal candidate will have experience in server architecture and protocol design, ensuring seamless communication between various system components. Your role will involve collaborating with our team to define the server requirements, implementing core functionalities, and conducting rigorous testing to guarantee performance and reliability. If you have a strong background in server-side development and a passion for creating efficient protocols, we would love to hear from you.

We are seeking a skilled professional to build a robust database system that incorporates AI functionalities. The ideal candidate will have experience in database architecture, data modeling, and AI technologies. You will be responsible for designing, implementing, and optimizing the database to support AI-driven applications. Strong problem-solving skills and the ability to work collaboratively are essential. If you are passionate about leveraging AI to enhance data management, we would love to hear from you.

• Describe your recent experience with similar projects

hello

we are looking android app developer for my 3 apps task my app is developed and tested everything is ready like icon , screenshot, discription, aab from my end i want to long term cooperation with you.


Thanks

We’re looking for a backend-focused AI engineer to manage the core infrastructure powering a real-time CRM, call agent system, and intelligent automation workflows. This role owns everything from DB access control to AI call processing and API orchestration.

Responsibilities
Maintain and evolve existing backend (Python-based logic, Supabase/PostgreSQL schema)
Configure and connect 3rd-party APIs for voice AI, transcription, scheduling, and MLS data
Orchestrate LangChain-style multi-agent workflows to support lead handling, document generation, and follow-up
Implement and test Stripe logic tied to user roles and feature access
Set up secure webhook pipelines for AI voice events, call summaries, and auto-tasks
Ensure all DB permissions are secure via row-level access (RLS)

Requirements
3+ years working in backend API development (Python, Node, or similar)
Deep experience with Supabase or Firebase, Stripe, and webhook logic
Experience working with AI APIs: GPT-4, ElevenLabs, Whisper, Vapi.ai, LangChain
Knows how to manage schema updates and real-time workflows
Comfortable optimizing performance and debugging async jobs

Bonus (Not Required)
Experience working on AI assistant logic, LLM agents, or CRM-based automations
Has deployed or contributed to real-world LangChain/AutoGen/GPT-4o apps
Familiar with voice AI pipelines and smart call routing

I am seeking a skilled freelancer to assist me with a file that won't open properly. When I try to access it, nothing displays, and I'm unable to determine the issue. If you have experience troubleshooting file problems and can help recover or access the content, please reach out. Your expertise will be invaluable in resolving this matter quickly and efficiently.

Appian Developer
Exp: 5+yrs
Location: Remote
Contract duration- 3 months initial

Roles & Responsibilities:
• Develop and implement the Appian and web-based Applications
• Provide technical guidance to mid-level developers as and when required.
• Understand the differences between REST, SOAP and the basic design principles in integrating to Web Services.
• Works with business users to translate business requirements into technical designs to map and load data from source systems to the data warehouse.
• Building critical Appian based application as well as associated integration components in Java/J2EE.
• Develop applications in Appian business process management and integrate with other COTS products.
• Problem Solver and ability to estimate and size Appian business requirements.
• Debug issues in Interfaces and Process Models

1. Additional comments:
• Good communication, good attitude, good at problem solving skills, flexible in working hours as per the client requirements.

• Are you a freelancer or an agency or working as a full time employee in a company ?
• Please attach your cv with project details to review.
• This is a 3 month extendable contract. Are you fine with it ?
• How much experience do you have in Appian ?
• What is your total experience ?

Agrovya is an established farm management platform helping farmers streamline operations, boost yields, and make smarter, data-driven decisions. Our software is already live and in use, and we're now expanding our team to maintain, optimize, and evolve the platform as we scale.

We're looking for passionate, skilled professionals to support our long-term vision through ongoing feature enhancements, technical support, and user-focused improvements.

Position 1: Senior Full-Stack Developer
Location: Remote (Middle East preferred)
Schedule: Must be available during Atlanta business hours (EST/EDT)
Contract Type: Long-term contract with potential for permanent hire

Responsibilities
Maintain and optimize existing web and mobile applications for farm management

Implement new feature requests and UI/UX improvements

Ensure mobile responsiveness and performance consistency across devices

Enhance RESTful APIs and ensure data integrity for agricultural systems

Integrate updates with IoT devices, weather data, and farm analytics tools

Monitor, debug, and deploy updates across cloud environments

Required Skills
Frontend: React.js, TypeScript, responsive design, modern CSS frameworks

Backend: Node.js, Python, or Java; API development; system architecture

Database: PostgreSQL or MySQL; experience with time-series data is a plus

Cloud: AWS, Azure, or GCP deployment & maintenance

Mobile: React Native or Flutter (preferred)

Experience: 5+ years in full-stack development, preferably in data-driven or AgTech projects

Compensation & Perks
Rate: $5–$20/hour based on experience

Fully remote, flexible work environment

Real-world impact in sustainable agriculture

Long-term growth potential and optional equity


Position 2: Agricultural Product Manager
Location: Remote (Global)
Schedule: Must be available during Atlanta business hours (EST/EDT)
Contract Type: Long-term contract

Responsibilities
Oversee the evolution of a fully developed AgTech platform

Work with users and stakeholders to prioritize improvements and features

Translate agricultural workflows into actionable product updates

Conduct user testing and analyze feedback for continuous improvement

Lead product roadmap development and feature rollouts

Required Experience
3+ years in product management (AgTech, SaaS, or B2B)

Deep understanding of agricultural processes and user needs

Strong stakeholder communication and analytical skills

Experience in precision agriculture, farm software, or field research is a plus

Compensation
$50–$20/hour based on experience

Performance-based bonuses

Strategic role with potential equity involvement


Position 3: Agricultural Domain Expert / Consultant
Location: Remote (Global)
Schedule: Flexible hours, with partial overlap with Atlanta time
Contract Type: Part-time (10–20 hours/week), consulting basis

Responsibilities
Provide expert guidance on farming workflows and best practices

Validate agricultural features and recommend improvements

Support educational content development and in-app guidance

Act as a bridge between farmers and technical teams

Required Background
5+ years farming or consulting experience in agriculture

Strong understanding of crop production, livestock, and seasonal workflows

Familiarity with digital tools in agriculture (FMIS, IoT, etc.)

Ability to clearly communicate agricultural knowledge to developers

Compensation
$40–$70/hour based on expertise

Part-time with potential to scale up

Equity participation opportunities available


Application Process (All Positions)
To apply, please submit:

A detailed proposal or resume highlighting relevant experience

Portfolio or examples of relevant work (e.g., apps, dashboards, research)

Confirmation of your timezone and working hours availability

A brief video (2–3 minutes) explaining your interest in agriculture and technology



Why Work With Agrovya?
Contribute directly to global food security and farm sustainability

Be part of a growing AgTech startup with real-world impact

Work in a collaborative, remote-first team

Engage in quarterly planning, regular team meetings, and professional development

Agrovya is committed to diversity and inclusion. We welcome applicants from all backgrounds who are passionate about agriculture and technology.

• Describe your recent experience with similar projects
• Include a link to your GitHub profile and/or website
• What frameworks have you worked with?
• Describe your approach to testing and improving QA

I am seeking a skilled freelancer who can assist me on iOS Discord to hide or delete messages from 20–24 users—without showing them as blocked or having those messages appear in search—ideally just on your side, but if needed both sides. The ideal candidate should have a deep understanding of Discord functionalities and iOS capabilities to ensure that changes are only visible on my side, but if needed both sides. Your expertise will help enhance my user experience while maintaining a clean interface. If you have experience with Discord's privacy settings and can navigate its platform seamlessly, I'd love to hear from you!

We are currently facing multiple performance and stability issues on our WebLogic server. I need a WebLogic and Java JVM expert who can:
• Help us analyze and understand thread dumps to identify deadlocks, stuck threads, or performance bottlenecks.
• Guide us on how to analyze heap dumps to troubleshoot memory leaks or excessive memory usage.
• Explain the results clearly so we can understand and potentially fix these issues internally in the future.
• Recommend tools (e.g., Eclipse MAT, jVisualVM, jstack) and best practices for ongoing JVM monitoring.

Requirements:
• Proven experience with WebLogic Server (11g/12c preferred)
• Strong understanding of JVM internals, garbage collection, memory management
• Familiarity with analyzing thread/heap dumps in production environments
• Good communication skills and ability to explain complex topics in simple terms

Preferred:
• Experience with Oracle FMW environments
• Experience working with enterprise-grade applications

Project Type:
One-time project (initial guidance with possible follow-up sessions)

Deliverables:
• 1:1 sessions (Zoom/Meet) to go through current dumps
• Actionable insights and documentation (if needed)
• Recommendations for future monitoring and debugging

We are seeking a skilled developer to create a cryptocurrency website that includes a fully functional crash game. The ideal candidate should have experience in web development, particularly in the gaming and cryptocurrency sectors. The project requires designing an engaging user interface, ensuring robust security protocols, and integrating blockchain technology for transaction handling. If you have a passion for gaming and crypto, we would love to hear from you!

• Describe your recent experience with similar projects

Hello Dear,
I have a N8n related project
Are you available now?

We are seeking a skilled developer to build and deploy a fully functional web application similar to Lottie.io, featuring a robust booking system. The application should incorporate AI integration to enhance the matching process for users. The ideal candidate will have experience in web app development, a strong understanding of AI technologies, and a passion for creating user-friendly interfaces. If you are ready to take on this exciting project, please apply and share your portfolio showcasing similar work.

• Describe your approach to testing and improving QA
• What frameworks have you worked with?
• Include a link to your GitHub profile and/or website
• Please list any certifications related to this project
• Describe your recent experience with similar projects

Torch with Micro IC 16F676 and the torch features are as follows:

7 nos. green flashing light, 7 nos. red flashing light, 1 no. white light, 1 charging socket, 2 Indicator LEDs (Low Battery indication, full battery indication, charging indication, and lamp on indication to be provided), 3 switches. 1. white- (press 1) dim white light, (press 2) bright white light, (Press 3) torch off 2. Red- (Press 1) flashing red light on, (Press 2) torch off 3. Green- (Press 1) flashing green light on, (Press 2) torch off.

IOS and Android development, more will be discussed over call.

• Describe your recent experience with similar projects
• Include a link to your GitHub profile and/or website

Job Description:


We’re looking for a skilled and detail-oriented QA tester based in Ghana to help us test the API functionality of our payin and payout systems.
You will play a key role in validating the reliability and accuracy of our payment processes, ensuring everything runs smoothly from start to finish.

Scope of Work:
* Conduct end-to-end testing of API-based payin and payout transactions
* Monitor and record the full transaction process, including responses and behavior at each stage
* Identify and report bugs or unexpected results with clear documentation
* Work closely with developers to replicate issues and verify fixes
* Offer suggestions to improve testing coverage and process reliability

Requirements:
* Must be physically located in Ghana (for regional payment flow testing)
* Prior experience testing financial APIs, especially payins/payouts is an advantage
* Ability to record and present clear test results and logs

Budget:
* This task is relatively straightforward and does not require deep technical expertise, so we’ve set a budget accordingly.
* Please provide the recording so that we can evaluate whether it is successful. Each test lasts around 5-10 minutes each.
* This is a part-time role (5 hours per week), with the possibility of increased hours depending on the volume of ongoing tests.

We are looking for a highly skilled SaaS Developer to design, develop, and maintain scalable software-as-a-service (SaaS) applications. You will work closely with product managers, designers, and other developers to deliver secure, high-performance cloud-based solutions that meet the needs of our customers.

Key Responsibilities:
Design and implement robust, scalable, and secure SaaS applications.

Collaborate with cross-functional teams to define, design, and ship new features.

Develop backend services and APIs, often using microservices architecture.

Integrate third-party APIs and services where needed.

Write clean, maintainable, and well-documented code.

Participate in code reviews, unit testing, and deployment processes.

Optimize applications for maximum speed, scalability, and performance.

Maintain CI/CD pipelines and cloud infrastructure (e.g., AWS, Azure, GCP).

Monitor, troubleshoot, and debug production issues.

Stay current with emerging technologies and industry trends in SaaS and cloud development.

Qualifications:
Required:
Bachelor's degree in Computer Science, Software Engineering, or related field.

3+ years of experience developing SaaS applications.

Proficiency in programming languages like JavaScript/TypeScript, Python, Java, Ruby, or Go.

Experience with modern frameworks (e.g., React, Vue, Node.js, Django, Rails).

Solid understanding of RESTful APIs and web services.

Experience with cloud platforms (AWS, Azure, or Google Cloud).

Familiarity with containerization tools like Docker and orchestration tools like Kubernetes.

Understanding of database technologies (SQL and NoSQL).

Preferred:
Experience with multi-tenant SaaS architecture.

Knowledge of authentication protocols (OAuth, JWT, SSO).

Familiarity with Agile/Scrum methodologies.

Experience with CI/CD tools (Jenkins, GitHub Actions, GitLab CI, etc.).

Part-Time Mobile App Developer (Fitness & Nutrition)

We’re building an all-in-one fitness and nutrition app that blends the best of MyFitnessPal, Strava, and an AI coach. OpenAI is already integrated; now we’re ready to polish the experience and expand its smarts, we are also considering shifting to Gemini.

What you’ll do

Frontend
• Refactor and clean the existing codebase.
• Squash UI bugs.
• Add new tabs and features.

Backend
• Refine nutrition logic using the Edamam API.
• Improve exercise-tracking logic and lay the groundwork for our own exercise database.

AI
• Extend our OpenAI integration so the assistant becomes fully context-aware by ingesting more first-party data (workouts, meals, wearables). Also shift to Gemini due to lower API costs.

Commitment: Part-time: 25–30 h/week for the next 3–6 months, with potential to extend.

We are looking for an experienced Java developer (min. 3 years) with a strong background in software architecture and technical requirements engineering to support us on a freelance basis.

🔧 Responsibilities:

Develop backend services using Java and Spring Boot
Define and document system and software architectures
Translate business requirements into technical specifications
Create and maintain technical documentation using UML diagrams (e.g., class diagrams, sequence diagrams) with tools like Draw.io or Enterprise Architect
Collaborate with the team in Scrum or Kanban setups
Communicate fluently in English (written and spoken)

✅ Requirements:

3+ years of professional Java development experience with Spring Boot
Strong experience in system/software architecture
Proficiency in creating UML-based documentation
Familiarity with agile methodologies (Scrum/Kanban)
Fluent English communication skills
Reliable and independent work in a fully remote setting
Availability to work in the GMT+1 or GMT+2 time zone (Central Europe)

💼 What we offer:

Long-term freelance collaboration on a remote basis
Flexible work hours within CET
Technically challenging projects
Direct and respectful communication in a professional team

If you meet the criteria and are available for a freelance collaboration, please apply with your Upwork profile, portfolio, and hourly rate.

• Describe your recent experience with similar projects
• Include a link to your GitHub profile and/or website