Mat3ra is seeking a Lead Frontend Engineer with strong expertise in React.js and JavaScript to join their R&D team in San Francisco. This is a full-time, on-site position where you'll be leading frontend development initiatives. The role requires extensive experience with modern JavaScript technologies and the React ecosystem. As a Lead Frontend Engineer, you'll be expected to bring technical leadership and deep knowledge of frontend architecture and best practices. The position emphasizes engineering excellence and offers an opportunity to work on cutting-edge R&D projects.