Worked on stabilizing native pen input and improving build reliability for Android projects using Java and ProGuard. In the shadps4-emu/ext-SDL repository, addressed a bug where native pen input could be stripped during code obfuscation by adding a targeted ProGuard rule to preserve the onNativePen method, ensuring consistent release behavior and reducing support risk. Later, in libsdl-org/SDL, updated ProGuard rules to accommodate a change in the getContext() method’s return type, preventing potential runtime errors for downstream applications. The work focused on precise, maintainable ProGuard configurations to support robust Android integrations without introducing new features.