Worked on enhancing the Thrift client within the facebook/fbthrift repository by implementing header propagation and improved response handling for RPC calls. Focused on consolidating APIs around genAwaitResponse, removing legacy paths such as genAwaitResponseWithReadHeaders, and extending support for headers in asynchronous operations. Updated the internal Thrift Hack compiler to align with these changes, ensuring that server-propagated headers are accessible with results and improving end-to-end observability and tracing. Utilized PHP, Hack, and Thrift for backend development and testing, resulting in a streamlined API surface and reduced maintenance overhead while enabling better interoperability across distributed systems.