During February 2026, the developer enhanced the CAUSW_backend repository by delivering a more robust and maintainable API layer using Java, Spring Framework, and JPA. They built new user interaction APIs, including post like, comment, and child-comment endpoints, while standardizing API responses and error handling to ensure consistency across controllers. Mapper logic was migrated from MapStruct to static mappers, reducing dependencies and improving performance. The developer expanded service-level unit tests with Mockito to validate API contracts and fixed several bugs, such as issues in post service and naming inconsistencies, resulting in a more reliable backend and streamlined frontend integration.