Worked on the FESOM/fesom2 repository to deliver a backward-compatibility feature that streamlines legacy mesh workflows. Developed and integrated a configuration switch, compute_oasis_corners, enabling conditional computation and writing of mesh corners to bridge older mesh formats with updated contour computation methods. This approach, implemented in Fortran and leveraging skills in code refactoring and configuration management, encapsulated changes behind a toggle to minimize risk and data disruption. The solution allowed users to migrate more smoothly from legacy to modern workflows, reducing manual data conversion and read errors, and demonstrated careful attention to safe code encapsulation and maintainability within a complex codebase.