New 
Senior Software Engineer - M365 Copilot App
 Microsoft | |
 United States, Washington, Redmond | |
 Nov 02, 2025 | |
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OverviewAre 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 worldwide. In this role, you'll not only build innovative features but also design and implement performance telemetry, analyze live site metrics, and use data-driven insights to reason about performance at scale. You'll help evolve the frontend foundations that enable teams across Microsoft-including Create, Copilot Notebooks, and Copilot itself-to deliver experiences that are fast, reliable, and intelligent. As a Senior Software Engineer, you'll lead the development of portable, scalable, and performant frontend patterns and strategies that advance the Microsoft ecosystem and drive AI value. Beyond building UI frameworks, you'll take ownership of performance monitoring by integrating telemetry signals, interpreting real-world performance data, and applying those insights to guide architectural decisions. You'll collaborate with engineers, designers, and researchers to bring inclusive, high-performing experiences to life, while influencing the core infrastructure that supports AI-powered productivity at 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 the M365 Copilot App-while ensuring performance telemetry is built into the experience. You will partner across Microsoft, including teams like Create, Copilot Notebooks, and Copilot, to evolve a shared frontend platform and define reusable, portable architectural patterns and best practices that enable consistent, intelligent, and data-driven performance 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 and applying insights from live site performance data to guide trade-offs. You will apply a data-driven approach to performance, leveraging real-world telemetry, experimentation, and diagnostics to continuously optimize responsiveness, accessibility, and reliability-using metrics like UPLT and live site dashboards to validate improvements. You will mentor engineers and foster a culture of technical excellence through best practices in frontend architecture, performance profiling, telemetry integration, and cross-platform design systems. | |