I will fix, debug or refactor your spring boot java application

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Kevin J

About this gig

I troubleshoot Java and Spring Boot applications, identify the cause of an issue and explain the changes made.


I am a Java backend engineer and AWS Certified Solutions Architect.


Areas covered by this Gig:

- Bugs, exceptions and runtime errors

- Startup, configuration and dependency-injection issues

- REST API, JWT, role-based access, CORS and Swagger issues

- JPA, Hibernate, MySQL and PostgreSQL problems

- Performance investigation and code refactoring

- Spring Boot 2 to 3 migration, including Jakarta EE, Java 17, Spring Security and Hibernate changes


Please check the selected package for the included scope, delivery time and revisions. I provide a clear explanation of the fix and detailed code comments.


Message me with the expected behaviour, error details, reproduction steps and Java/Spring Boot versions. Share only code you are allowed to provide, and remove passwords, API keys and private data from logs and screenshots.

Get to know Kevin J

Kevin J

Java Backend Engineer

  • FromAustralia
  • Member sinceOct 2024
  • Languages

    English, Chinese
I'm a Java backend engineer and AWS Certified Solutions Architect, focused on Spring Boot applications, REST APIs and maintainable code. I help with Java bug investigation, refactoring and code reviews. I also work with React, Next.js and TypeScript for clearly scoped web features. Message me with your goal, current stack and project size so we can agree on the scope and deliverables before work begins.