Worked on the nodejs/node repository to enhance the stability and safety of N-API thread-safe functions in C++ and JavaScript environments. Focused on resolving a data race and use-after-free issue during finalization, the developer implemented mutex-protected finalization and delayed deletion logic to ensure thread safety when multiple threads interact with napi_threadsafe_function handles. This approach improved resource management, particularly during environment shutdown and abort flows, reducing the risk of crashes and dangling handles for native addons. The work demonstrated strong concurrency management skills and contributed to the core runtime’s reliability by addressing complex edge cases in multi-threaded Node.js applications.