Mike Kelly developed a security feature for the emqx/emqx repository, focusing on enhancing authentication for QUIC-based services. He implemented peer certificate extraction in Erlang, enabling QUIC mTLS listeners to use peer certificates as usernames, which allows for more granular identity verification and improved auditability. His work included integrating the quicer:peercert/1 function and updating related flows to support per-peer authentication. Mike also wrote comprehensive end-to-end tests and updated documentation to ensure reliability and clarity. Drawing on his expertise in backend development, network programming, and security, he delivered a well-tested, maintainable solution that strengthens QUIC authentication mechanisms.