React & TypeScript Expert for UI Enhancements

I'm seeking assistance with feature implementation, specifically around user interface components in React and TypeScript. The primary focus will be on building UI components for a widget, so experience and expertise in building, debugging, and optimizing complex React and Typescript components is crucial along with experience writing test-cases for each feature and components being built.

Ideal Skills:
- Advanced knowledge of React and TypeScript
- Strong experience with UI component development
- Proficiency in building and optimizing design system.
- Proficiency writing test-cases.

Please provide examples of similar projects you've worked on.