Are you a UX engineer passionate about crafting high-performing, scalable frontend experiences that power AI productivity? Join the M365 Copilot App team in Redmond, WA, where we're shaping the future of AI-driven user interfaces used by millions of people around the world. You'll shape and evolve the frontend foundations which enable teams across Microsoft - including Create, Copilot Notebooks, and Copilot itself - to deliver seamless, intelligent productivity solutions. As a Senior Software Engineer - M365 Copilot App, you'll lead the development of portable, scalable, and performant frontend patterns and strategies that help evolve the Microsoft ecosystem and drive AI value. You'll collaborate with engineers, designers, and researchers to bring high-performing, inclusive, and scalable experiences to life. This role offers a unique opportunity to influence the core infrastructure that supports AI-powered productivity and to grow your expertise in frontend architecture at a global scale.