Worked on nonebot/nonebot2 and microsoft/playwright-python, delivering targeted improvements in configuration management and callback handling. Developed two features for nonebot/nonebot2 using TypeScript and React, including an official status indicator for plugins to enhance trust and a refactored issue submission process that allows flexible user feedback. Focused on clear commit traceability and documentation updates to support maintainability. In microsoft/playwright-python, addressed a bug in the Connection class by ensuring callbacks were registered only once, preventing duplicate processing and improving test reliability. Demonstrated proficiency in JavaScript, Python, and frontend development while prioritizing stability, user experience, and codebase governance throughout the work.