Worked on enhancing the upgrade workflow in the AntaresSimulatorTeam/AntaREST repository by refactoring the upgradeStudy API to improve usability and align with RESTful design principles. The approach involved moving the target_version parameter from the JSON body to a query parameter, which reduced payload size and clarified parameter handling for future maintainability. Using TypeScript and leveraging skills in API development and RESTful services, the changes were implemented through two commits that addressed UI API usage and ensured backward compatibility. This work laid the foundation for ongoing API enhancements, focusing on clearer, more consistent interfaces and an improved developer experience.