Worked on the Samsung/TizenFX repository, focusing on both stability improvements and long-term API modernization. Addressed a critical memory management issue in the WiFi subsystem by eliminating a double-destroy vulnerability in the ReleaseHandle path, which reduced crash risk and aligned with ASAN findings for memory safety. Later, contributed to the deprecation of the Telephony API by marking affected classes and interop methods as obsolete, providing a clear migration path for upstream teams. Utilized C# and applied expertise in bug fixing, API deprecation, and Tizen development to enhance maintainability, security, and alignment with the evolving product roadmap over two months.