Worked on the microsoft/libHttpClient repository, focusing on enhancing code stability, maintainability, and static analysis readiness. Addressed thread-safety in tracing by making client callbacks atomic and ensuring proper synchronization for registration and unregistration, reducing race conditions and improving cross-compiler reliability. Improved code quality by adding SAL annotations and refining error logging macros, which clarified API semantics and supported future maintenance. Delivered a new SAL annotation macro for writable elements, further strengthening static analysis and code correctness. Utilized C and C++ with expertise in concurrency, code annotation, and debugging, consistently prioritizing long-term maintainability and reducing the surface for future defects.