Worked on the Samsung/TizenFX repository to decommission legacy security APIs, focusing on the removal of all TEEC module and Device Policy Manager APIs within the Tizen.Security namespace. This effort involved a comprehensive refactor using C# and backend development skills, targeting a reduction in the API maintenance surface and aligning the codebase with future security architecture requirements. The approach emphasized clear commit traceability and systematic deprecation, ensuring that the API surface was streamlined for improved governance. By eliminating outdated components, the work enhanced the security posture and prepared the system for upcoming architectural changes, reflecting depth in system architecture expertise.