Senior Frontend Engineer, Annotation Tools

We’re seeking a detail-oriented Senior Frontend Engineer to build world-class web-based annotation tools using React and TypeScript. You’ll design and implement modular, scalable frontend architectures that power multiple annotation workflows (image, text, audio) in a shared platform. You’ll create responsive, high-quality interfaces that enable global annotators to work efficiently-combining exceptional frontend craftsmanship with thoughtful system design and AI-assisted productivity. This role is ideal for someone who values design quality, architectural clarity, and close collaboration with product and design partners.