Worked on enhancing configurability and observability in vitejs/vite-plugin-react by introducing a configurable CSS precedence option for React resources and implementing a callback to notify when client reference dependencies load during server-side rendering. These features improved resource handling and dependency tracking, laying groundwork for future stability. In TanStack/store, focused on reliability by adding targeted unit tests for the batch method, ensuring correct state updates and aligning tests with the evolving batch API. Collaborated closely with team members to reinforce code quality and test coverage. Utilized TypeScript, React, and state management techniques throughout, emphasizing maintainability and robust front end development practices.