Worked on the reportportal/service-api repository to enhance API consistency and client usability by standardizing pagination across launches, test items, and related service interfaces. Refactored backend endpoints and service layers to return Page objects instead of Iterable, ensuring reliable paging and enabling accurate OpenAPI schema generation. Improved the API contract by specifying exact return types for Launch and TestItem controllers, which aligned documentation with runtime behavior and stabilized client integration. Utilized Java for backend development, applying skills in API design and OpenAPI Specification to deliver a more predictable and maintainable API experience. Focused on robust engineering and clear contract definition.