The Senior UI Engineer will lead the design, development, and implementation of high-quality user interface features using React and other modern UI technologies. Responsibilities include driving best practices in code quality, mentoring junior developers, collaborating with cross-functional teams, and staying abreast of emerging technologies. The role requires expertise in HTML, CSS, JavaScript, TypeScript, and experience with state management libraries and testing frameworks. The ideal candidate will also contribute to strategic planning and possess excellent communication skills.