During May 2025, Itharbors refactored asynchronous I/O operations in the streamich/memfs repository, migrating from setImmediate to Promises to enhance performance and predictability. This work involved updating the TypeScript codebase to leverage modern JavaScript features, resulting in faster and more reliable file system operations within Node.js environments. Itharbors also removed legacy setImmediate-related tests and imports, streamlining the code and reducing technical debt. The refactor improved latency consistency for I/O-heavy workloads by ensuring operations execute within the current task stack. The focused scope and disciplined git practices demonstrated a strong grasp of asynchronous programming and codebase maintenance in production systems.