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I will build a java spring boot rest API with database and unit tests
Yuki Buwana
About this gig
Need a reliable Java backend? I'm a senior Java engineer with nearly 20 years of experience building enterprise systems for banking, finance, payroll and logistics. I'll build a clean, well-tested REST API with Spring Boot that is ready for production.
What you get:
- REST API with Java 17 and Spring Boot 3
- MySQL or PostgreSQL with JPA/Hibernate
- Request validation and proper error handling
- Unit and integration tests (JUnit 5, Mockito)
- API documentation with Swagger/OpenAPI
- Docker setup so it runs anywhere
- Clean, commented source code in your Git repository
I can also help with:
- Payment gateway and third-party API integration (HMAC signing, idempotency, webhooks)
- JWT / Spring Security authentication
- Fixing bugs or extending an existing Spring Boot or Quarkus project
Why work with me:
- Led backend teams of up to 10 engineers on enterprise projects
- Clear written communication and regular progress updates
- Available evenings in GMT+7, which overlaps with US mornings and European afternoons
Please message me before ordering so we can agree on the scope.
Get to know Yuki Buwana
Yuki Buwana
Senior Java Spring Boot Backend Engineer
- FromIndonesia
- Member sinceNov 2026
- Avg. response time1 hour
Languages
English, Indonesian
Senior Java backend engineer with nearly 20 years of experience building enterprise systems, from payment gateway integrations to payroll, booking and airport platforms. I build clean, tested REST APIs with Java 17, Spring Boot 3 and Quarkus, using MySQL/PostgreSQL, JUnit, Docker and CI/CD. I’ve led teams of up to 10 engineers, so you get production-ready code, clear communication and on-time delivery. Available evenings (GMT+7) for long-term or one-off projects
FAQ
What do I need to provide before you start?
A short description of the features, your data model or sample data, and your preferred database. If you have an existing project, share the repository and I will review it first.
Will I own the source code?
Yes. You get the full source code in your Git repository (GitHub, GitLab or Bitbucket), with a README explaining how to run, test and deploy it.
Can you work on my existing Spring Boot project?
Yes. I can fix bugs, add features, write tests or upgrade to newer Java and Spring Boot versions. Send me the details first so I can quote the right package.
