Worked on the mixxxdj/mixxx repository to enhance DJ controller integration by both simplifying hardware mappings and improving MIDI protocol handling. Over two months, removed deprecated tap beat mapping for the DDJ-400 and DDJ-FLX4 controllers, reducing maintenance overhead and aligning the codebase with a focus on higher-value features. Subsequently, addressed a MIDI data processing bug affecting Shift+Play functionality on the DDJ-FLX4, restoring expected controller behavior and improving reliability. Demonstrated expertise in C++ and embedded systems, applying robust debugging and Git-based workflows to deliver targeted, maintainable changes that stabilized controller interactions and supported long-term codebase hygiene for DJ software development.