Worked on the flutter/flutter repository to improve the reliability of Flutter engine initialization on macOS by addressing a bug related to duplicate binary messenger initialization. Focused on Objective-C and macOS development, the work involved removing redundant object creation in FlutterEngine.mm, which streamlined the startup flow and reduced memory usage. This technical approach enhanced startup stability and minimized variability for macOS Flutter applications. No new user-facing features were introduced during this period, as the emphasis was on code quality, risk reduction, and platform-specific reliability. Demonstrated proficiency in Flutter framework internals, Objective-C programming, and disciplined code review practices throughout the process.