Browse categories
Explore
Fiverr Pro
English
$
USD
I will fix java spring boot rest API bugs and backend errors
Thinusha Supun
About this gig
Are you facing bugs or unexpected behaviour in a Java Spring Boot application or REST API? I will investigate the issue, identify the root cause, and provide a clean, reliable fix.
I am a Software Engineer with over two years of experience in Java, Spring Boot, REST APIs, MySQL, MariaDB, and enterprise backend systems.
I can help with:
- Java and Spring Boot errors
- REST API 400, 401, 403, 404, and 500 errors
- Application startup and configuration issues
- Spring Security and JWT problems
- Hibernate, JPA, and database errors
- MySQL and MariaDB connection issues
- Maven and Gradle dependency problems
- Validation and exception-handling errors
- Third-party API integration bugs
- Backend logic and performance issues
You will receive:
- Root-cause investigation
- Clean, maintainable code fixes
- Testing of the corrected functionality
- Fix notes or code comments based on your package
- Clear communication
Please contact me before ordering. Provide the error message, logs, relevant code, expected behaviour, actual behaviour, and project setup details. I will review the issue and recommend the correct package.
Get to know Thinusha Supun
Thinusha Supun
Software Engineer, Web Applications, REST APIs, SQL
- FromSri Lanka
- Member sinceJul 2026
Languages
Sinhala, English
I help businesses build secure, scalable web applications, REST APIs, and database solutions.
As a Software Engineer with 2+ years of enterprise experience in the insurance and media industries, I specialize in Java, Spring Boot, Angular, MySQL, and MariaDB. From backend APIs to SQL optimization and business applications, I deliver reliable, maintainable, and high-performance solutions tailored to your business needs.
Other Software Development Services I Offer
FAQ
What information should I provide before placing an order?
Please provide the error message, screenshots, relevant logs, affected source code, expected behaviour, actual behaviour, Java and Spring Boot versions, database details, and instructions for running the project.
Should I contact you before ordering?
Yes. Please contact me first so I can review the issue, confirm whether it is within the Gig scope, and recommend the correct package, delivery time, and price.
What types of Java Spring Boot bugs can you fix?
I can investigate REST API errors, Spring Security and JWT issues, application startup failures, Hibernate and JPA errors, database connection problems, dependency conflicts, validation errors, exception-handling issues, and backend logic bugs.
Can you fix bugs without access to the complete project?
Some isolated issues can be fixed using the relevant code, logs, and configuration files. However, complex problems may require access to the complete project or a minimal reproducible version of the application.
Will you test the application after fixing the bug?
Yes. I will test the corrected functionality based on the available project setup and provided test scenario. The buyer should also perform final testing within their complete development or staging environment.
Do you develop new features under this Gig?
This Gig is mainly for diagnosing and fixing existing backend bugs. New modules, major feature development, or complete application development should be discussed separately before ordering.
