During June 2025, Justin Funston focused on improving reliability in the amzn/rdma-core repository by addressing a critical concurrency issue in the RXE CQ_EX polling path. He identified and fixed a bug in C where the spin lock could be unlocked twice during polling, which previously risked undefined behavior and potential crashes under load. By ensuring the spin lock is released exactly once per poll cycle, Justin aligned the implementation with man page guidance and enhanced system stability. His work demonstrated strong skills in low-level programming and concurrency, and he contributed thorough code review and documentation to support future maintainability.