During September 2025, Charles Hawley focused on enhancing the stability of the fbthrift repository by addressing concurrency and memory management challenges in the AdaptiveConcurrency component. He implemented a snapshot-based approach to maintain a valid reference to the configuration object across function calls, effectively reducing the risk of heap-use-after-free errors under concurrent configuration changes. Working primarily in C++ and leveraging his expertise in concurrency control, Charles resolved a potential crash scenario, thereby improving server reliability and uptime. Although no new features were introduced, his targeted bug fix delivered measurable business value by ensuring more predictable performance and safer code execution under load.