Worked on the envoyproxy/envoy repository to implement TLS certificate compression, focusing on reducing handshake size and improving connection efficiency for both QUIC and TCP protocols. Used C++ to add support for Brotli and zlib algorithms as specified in RFC 8879, enabling compressed certificate transmission during the TLS handshake. Refactored the existing QUIC-specific handshake logic into a shared implementation for both QUIC and TCP, maintaining backward compatibility and a clean abstraction layer. This approach streamlined maintenance and future enhancements while addressing an integration issue related to certificate compression. The work leveraged expertise in C++, network programming, QUIC, and TLS.