Miguel Horta worked on the OpenTTD/OpenTTD repository, focusing on enhancing the reliability and maintainability of the Game Options window. He refactored the window’s code by replacing a hardcoded tab value with a dynamic reference to the active_tab, reducing the risk of UI tab-related errors in future updates. This targeted change improved the maintainability of the user interface and streamlined future development. Miguel applied his skills in C++ development, UI design, and game development to implement this feature. The work demonstrated a focused approach to code quality, addressing a specific maintainability concern within a complex, established codebase.