Browse categories
Explore
Fiverr Pro
English
$
USD
I will develop, modernize, and migrate java spring boot applications
Rounak Mazumdar
About this gig
Need a reliable Java Spring Boot developer to build, modernize, migrate, or fix your application?
I provide professional Java and Spring Boot development services for new and existing backend applications. Whether you need a REST API, database integration, legacy application modernization, bug fixing, or a complete backend solution, I can help.
My services include:
* Java & Spring Boot development
* REST API development & integration
* Spring MVC, Spring Data JPA & Hibernate
* MySQL & PostgreSQL database integration
* Legacy Java application modernization
* Java & Spring Boot migration
* Bug fixing & troubleshooting
* Performance optimization & code refactoring
* Authentication & authorization
* Third-party API integration
* Microservices development
* Maven/Gradle configuration
I focus on clean, maintainable, secure, scalable, and production-ready code. I can work with your existing project or develop a solution from scratch according to your requirements.
Please message me before placing an order so we can discuss your project, requirements, and scope.
Get to know Rounak Mazumdar
Rounak Mazumdar
Java Developer
- FromIndia
- Member sinceAug 2026
- Avg. response time1 hour
Languages
English, Bengali, Hindi, Spanish
I engineer the systems businesses depend on.
Having over six years of experience modernizing enterprise platforms, building resilient APIs, and leading delivery for global teams—from retail at scale to legal-tech.
FAQ
What Java Spring Boot services do you provide?
I provide Java and Spring Boot development, REST API development, database integration, bug fixing, code refactoring, application modernization, migration, authentication, third-party API integration, and microservices development.
Can you work on an existing Spring Boot project?
Yes. I can work with your existing project to fix bugs, add new features, improve performance, refactor code, upgrade dependencies, or modernize the application.
Can you migrate my Java or Spring Boot application?
Yes. I can help migrate legacy Java/Spring applications to newer Java and Spring Boot versions while maintaining functionality and improving compatibility.
Can you develop a Spring Boot application from scratch?
Yes. I can develop a backend application from scratch based on your requirements, including APIs, database connectivity, authentication, and required business logic.
Which databases can you work with?
I can work with relational databases such as MySQL and PostgreSQL and integrate them with Spring Boot using technologies such as Spring Data JPA and Hibernate.
Can you fix bugs in my Java application?
Yes. I can investigate errors, identify the underlying cause, fix the issue, and help verify that the application works correctly afterward.
Can you integrate third-party APIs?
Yes. I can integrate external REST APIs and other required services into your Spring Boot application according to your project's requirements.
What do you need from me before starting?
Please provide your project requirements, existing source code if applicable, technical specifications, expected functionality, and any relevant API or database details.
