Over 14 months, Susko contributed to cross-platform input, windowing, and build system improvements across ppy/osu-framework, libsdl-org/SDL, and related repositories. They engineered robust pen input handling and SDL3 integration, refactored input event processing, and enhanced platform-specific behaviors for Android and Windows. Using C, C#, and CMake, Susko addressed edge cases in pen proximity, window resizing, and controller unplugging, while improving test reliability and static analysis clarity. Their work included code refactoring, configuration management, and UI/UX adjustments, resulting in more stable, maintainable codebases. The depth of their contributions reflects strong engineering fundamentals and attention to cross-platform reliability.