During November 2024, Andreas Mertz focused on stabilizing the user authentication system for the aau-giraf/weekplanner-api repository. He addressed a critical issue in the backend by correcting the inheritance of the GirafUser class from IdentityUser, ensuring that the UserName and Email properties were properly overridden. This fix, implemented in C#, restored reliable registration and login flows, directly reducing user friction and support requests. Although no new features were released, Andreas applied his skills in API development and backend engineering to improve the robustness of user authentication, demonstrating a methodical approach to resolving complex issues in production systems.