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I will build, fix, and improve your java spring boot rest API
Vladyslav S
About this gig
I am senior Java Spring boot and REST API developer with 5 years of experience.
Need help building, fixing, or improving a Java Spring Boot REST API?
I can handle tasks of any complexity of backend tasks, including:
fixing reproducible Spring Boot errors
creating or updating REST API endpoints
building CRUD features
configuring Spring Security and role-based access
working with Spring Data JPA, Hibernate, MySQL, and Flyway
adding validation and centralized error handling
creating Swagger/OpenAPI documentation
integrating third-party APIs
configuring Docker Compose
writing JUnit 5 and RestAssured tests
reviewing, refactoring, and documenting existing code
What you receive:
clean, tested source code
clear setup and run instructions
an explanation of the changes
communication throughout the order
Please contact me before ordering. Send your repository or source code, task description, error logs, setup instructions, and expected result. I will review the scope and confirm the right package, price, and delivery time.
Get to know Vladyslav S
Vladyslav S
Java Spring Boot Developer
- FromUkraine
- Member sinceJul 2026
Languages
English, Ukrainian, Russian, Polish
Java & Spring Boot developer focused on REST APIs, backend debugging, API testing, and full-stack integrations. I work with Java 17, Spring Security, JPA/Hibernate, MySQL, Flyway, Docker, Swagger/OpenAPI, JUnit, Postman, RestAssured, React, and TypeScript. I can build CRUD APIs, fix bugs, add endpoints, configure databases, write automated tests, connect frontends, and improve existing code. I provide tested solutions, clear communication, and setup instructions.
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FAQ
Should I contact you before placing an order?
Yes. Please send the task description, source code or repository, error logs, setup instructions, and expected result. I will review the scope and recommend the correct package.
What do you need to start working?
I need the source code or repository, Java and database versions, setup instructions, current error logs, steps to reproduce the issue, and a clear description of the expected result.
Can you work with an existing Spring Boot project?
Yes. I can debug, extend, test, refactor, and document existing Spring Boot applications. The project should include the dependencies and instructions required to run it locally.
What is included in the Quick Fix package?
The Basic package covers one reproducible Spring Boot issue or one small REST API endpoint. Larger or multiple issues may require the Standard or Premium package.
Do you provide tests and documentation?
Basic verification is included. Additional automated JUnit 5 or RestAssured tests can be ordered as an extra. Swagger/OpenAPI and setup documentation can be included depending on the package.
