During May 2025, Jiafu Zha enhanced the fzyzcjy/Mooncake repository by implementing configurable handshake listen backlog support in the Transfer Engine. Using C++ and system programming techniques, Jiafu introduced the MC_HANDSHAKE_LISTEN_BACKLOG environment variable, allowing runtime adjustment of the backlog size with a safe default of 128. This change improved network configuration flexibility and scalability, enabling deployments to better handle varying connection loads without sacrificing reliability. The work maintained backward compatibility and emphasized maintainability by exposing configuration through environment variables. Jiafu’s contribution focused on robust network configuration, demonstrating depth in C++ and system-level network programming within a production codebase.