Worked on the facebook/fbthrift repository to enhance local loopback handling for Thrift servers, enabling plaintext connections from localhost on demand and reducing TLS-related failures in local RPC scenarios. Developed a pluggable loopback address detection mechanism in C++ that distinguishes effectively loopback addresses, integrating a customizable function to support both default and Meta-specific behaviors. The implementation maintained backward compatibility for non-Meta environments, ensuring plaintext connections are only enabled when explicitly requested. Collaborated closely with code reviewers and documented the changes thoroughly. This work demonstrated strong backend development and network programming skills, addressing nuanced networking issues in a complex codebase.