Thomas Rackow focused on code refactoring and legacy code maintenance in the FESOM/fesom2 repository, targeting the initialization process for remapping between atmospheric Gaussian grids and ocean UV-grids. He removed unused vector-related logic from the nemogcmcoup_coupinit module, eliminating obsolete handling of interpolation weights and simplifying the initialization pathway. Working primarily in Fortran, Thomas improved code clarity and reduced complexity, which helps minimize future maintenance overhead and potential sources of error. Although no bugs were fixed during this period, his work established a cleaner baseline for future development, reflecting a methodical approach to long-term maintainability and reliability in scientific computing environments.