Principal Software Engineer
 Microsoft | |
 United States, California, Mountain View | |
 Aug 14, 2025 | |
|
OverviewAre you a UX engineer passionate about crafting high-performing, scalable frontend experiences that power AI productivity experiences? Join the M365 Copilot Hub 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 architect the frontend foundation that enables teams across Microsoft - including Create, Copilot Notebooks, and Copilot itself - to deliver seamless, intelligent productivity solutions. As a Principal Software Engineer, you'll lead the design and implementation of frontend patterns and performance strategies. 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. Microsoft's mission is to empower every person and every organization on the planet to achieve more. As employees, we come together with a growth mindset, innovate to empower others, and collaborate to realize our shared goals. Each day we build on our values of respect, integrity, and accountability to create a culture of inclusion where everyone can thrive at work and beyond.
ResponsibilitiesYou will design and implement scalable, high-performance frontend systems using React, Typescript, microfrontends, and modern rendering stacks to power AI productivity experiences across M365 Copilot. You will partner across Microsoft, including teams like Create, Copilot Notebooks, and Copilot, to evolve a shared frontend platform and define reusable architectural patterns and best practices that enable consistent, intelligent, and high-performing user experiences at scale. You will lead architectural decisions and contribute hands-on code to advance the state of the art in frontend engineering, balancing innovation with platform stability. You will apply a data-driven approach to performance, leveraging real-world telemetry, experimentation, and diagnostics to continuously optimize responsiveness, accessibility, and reliability. You will mentor engineers and foster a culture of technical excellence through best practices in frontend architecture, performance profiling, and cross-platform design systems. | |