During January 2025, Lee Jin focused on stability improvements for the facebook/react-native repository, specifically targeting Apple Silicon iOS build environments. Addressing a crash in TextInput, Lee reverted a previous change in AttributedString that had disabled WeakEventEmitter, restoring its behavior to resolve serialization issues unique to Apple Silicon Macs. This work required targeted debugging and effective rollback management, ensuring that both build and runtime paths remained stable. Utilizing React Native, Objective-C++, and iOS development expertise, Lee’s efforts improved CI reliability and reduced flaky failures in TextInput scenarios, demonstrating a deep understanding of environment-specific challenges and robust problem-solving skills.