Khushwinder S.Private profile: Upwork shows its earnings only to signed-in members, so we check it every few weeks, not daily. MRR here is a rough estimate (Upwork's six-month earnings ÷ months active). Last read Nov 5, 2026.

Need a reliable Java/Spring Boot developer to build, fix, or extend your backend application or REST API? I develop backend and full-stack web applications using Java, Spring Boot, REST APIs, PostgreSQL, MySQL, Hibernate/JPA, and React. I can help with: • Java & Spring Boot backend development • REST API design, development, and integration • Database design and integration with PostgreSQL/MySQL • Spring Data JPA & Hibernate • Authentication and authorization with Spring Security/JWT • Bug fixing, debugging, and existing Java application enhancements • Unit and API testing with JUnit, Mockito, and MockMvc • API documentation with Swagger/OpenAPI • React frontend integration with Spring Boot APIs • Docker containerization and AWS deployment Recent projects include a full-stack Dealership Management System built with Java 21, Spring Boot, PostgreSQL, React, JWT authentication, Docker, and AWS, as well as a Mini DNS REST API implementing A/CNAME records, recursive CNAME resolution, TTL expiration, asynchronous cleanup, validation, exception handling, and automated testing. I have previous software development experience working with Java/J2EE applications and am currently focused on modern Java, Spring Boot, REST API, database, and full-stack development. I value clear communication, maintainable code, careful testing, and delivering solutions that meet the actual business requirement. If you have a Java/Spring Boot API, backend application, bug, database integration, or full-stack project, send me a message and tell me what you need.