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I will develop, fix, or optimize your java spring boot rest API
Jonathan G
About this gig
Need help with a Java Spring Boot REST API?
I can develop, fix, improve, or optimize your Spring Boot backend, whether you need help solving a specific issue or implementing new REST API functionality.
I can help you with:
- REST API development and integration
- Spring Boot configuration and troubleshooting
- Controllers, services, repositories, DTOs, and entities
- Spring Data JPA and Hibernate
- SQL database integration
- Maven configuration and build issues
- Bug fixing and debugging
- Exception handling and validation
- API optimization and code improvements
- Swagger / OpenAPI documentation
- Unit and integration testing
Technologies I work with:
Java, Spring Boot, Spring MVC, Spring Data JPA, Hibernate, Maven, REST APIs, SQL, Git, Swagger/OpenAPI, and related backend technologies.
I focus on clean, maintainable code and solutions adapted to your existing project and requirements.
Please contact me before ordering if you have a complex project or are unsure which package fits your needs. Send me your requirements, existing code (if applicable), error messages, and expected result so I can review the scope before we start.
Package scope depends on the complexity and number of changes required. New
Get to know Jonathan G
Jonathan G
Senior Analyst Java Developer
- FromSpain
- Member sinceSep 2026
Languages
Spanish
I am a Senior Analyst and Java Developer with over 13 years of experience in IT consultancy and application development. I specialize in BackEnd development using Java, with additional expertise in COBOL, Angular, SQL, Git, and SVN. I am a responsible professional with a strong disposition for teamwork and a continuous drive to learn new technologies.
FAQ
Do I need to contact you before placing an order?
Yes, I strongly recommend contacting me before ordering, especially for new development or complex issues. Send me your requirements and any relevant code or error messages, and I will help you choose the right package.
Can you work on an existing Spring Boot project?
Yes. I can analyze an existing Java Spring Boot project to fix bugs, implement changes, improve REST APIs, or optimize existing code. Please provide the relevant source code and a clear description of the expected result.
Can you fix Maven or Spring Boot errors?
Yes. I can troubleshoot Spring Boot startup issues, Maven build and dependency problems, configuration errors, exceptions, REST API issues, and other backend-related problems.
Which databases can you integrate with?
I can work with SQL databases commonly used with Spring Boot and Spring Data JPA. Please contact me before ordering to confirm your specific database and requirements.
Does a revision include new features?
No. Revisions cover reasonable changes related to the requirements originally agreed upon. New features, additional endpoints, integrations, or requirements outside the original scope may require an additional fee or a custom offer.
What do you need from me to start?
Please provide a clear description of the task, expected result, relevant source code or repository files, error messages or logs if applicable, Java and Spring Boot versions, database information if relevant, and any API specifications or examples available.
Can you develop a complete application?
Yes, depending on the project scope. Larger applications should be discussed before ordering so I can review the requirements, estimate the work involved, and provide a custom offer if necessary.
