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I will develop java spring boot rest apis or fix backend bugs
Su L
About this gig
Need to build a Java Spring Boot REST API or fix an existing backend problem?
I can develop, debug, or extend Spring Boot backend applications based on your requirements.
I can help you with:
- RESTful API development and CRUD operations
- Spring Boot bug fixing and debugging
- REST endpoint and backend errors
- Spring Data JPA and database issues
- MySQL database integration
- JWT authentication and login issues
- Spring Security and role-based authorization
- Input validation and exception handling
- Swagger / OpenAPI documentation
- Basic unit testing
For new API projects, you can receive:
- Complete Java source code
- Clean project structure
- Database configuration
- Clear setup and running instructions
I can work on APIs for users, products, orders, bookings, inventory, authentication systems, and other backend requirements.
Already have a Spring Boot project?
I can review your existing code, investigate errors, fix bugs, add or modify REST endpoints, and help resolve backend, database, JPA, JWT, or Spring Security problems.
Please contact me before ordering if the issue is complex, affects multiple parts of the application, requires third-party integrations or deployment, or if you are unsure which pa
Get to know Su L
Su L
AI Automation and Software Developer, Agents, APIs, RAG
- FromIreland
- Member sinceAug 2026
- Avg. response time1 hour
- Last delivery1 month
Languages
English, Chinese, French
I build AI automation, AI agents, RAG systems, API integrations, and full-stack AI applications that solve real business problems.
I help businesses automate workflows, connect APIs and tools, build AI-powered support and knowledge systems, and integrate AI into existing applications.
I work with Python, FastAPI, Java, Spring Boot, REST APIs, PostgreSQL, MySQL, Docker, TypeScript, AWS, n8n, and modern AI/LLM integrations.
I focus on practical, maintainable, production-ready software with reliable delivery.
My Portfolio
Other Software Development Services I Offer
FAQ
Q: Can you build a REST API from scratch?
Yes. I can design and develop a Spring Boot REST API from scratch, including endpoints, business logic, database integration, validation, and error handling.
Q: Can you add authentication and authorization?
Yes. I can implement secure authentication and authorization such as JWT-based authentication and role-based access control when required.
Q: Can you connect the backend to a database?
Yes. I can integrate Spring Boot applications with databases such as MySQL or PostgreSQL using JPA/Hibernate.
Q: Can you fix or extend an existing Spring Boot project?
Yes. I can review an existing codebase, debug issues, add endpoints or features, improve database integration, and help with backend problems. Please contact me before ordering if the scope is unclear.
