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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.

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.

Responsibilities

+ You 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 App.

+ 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 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.

Qualifications

Required Qualifications:

+ Bachelor's Degree in Computer Science or related technical field AND 4+ years technical engineering experience with coding in languages including, but not limited to, C, C++, C#, Java, JavaScript, or Python

+ OR equivalent experience.

+ 4+ years of experience in frontend architecture, performance engineering, or scalable web application development.

Preferred Qualifications:

+ Proven expertise in modern frontend technologies including React, Typescript, and with a track record of delivering performant, accessible, and scalable experiences in production.

+ Data‑centric approach to engineering that integrates usage analytics and experimentation into planning, design, and iteration to drive measurable business impact.

+ Customer obsessed and passionate about product impact.

+ Ownership of a complex frontend system or framework such as a microfrontend orchestration layer or a high-scale web experience with strict performance SLAs, delivered in production and adopted across multiple teams or products.

+ Ability to elevate engineering culture and practices through initiatives that led to measurable improvements in performance, platform adoption, or developer productivity across teams or organizations.

+ Grounded in growth mindset, and advocate for diversity and inclusion.

Software Engineering IC4 - The typical base pay range for this role across the U.S. is USD $119,800 - $234,700 per year. There is a different range applicable to specific work locations, within the San Francisco Bay area and New York City metropolitan area, and the base pay range for this role in those locations is USD $158,400 - $258,000 per year.

Certain roles may be eligible for benefits and other compensation. Find additional benefits and pay information here: https://careers.microsoft.com/us/en/us-corporate-pay

Microsoft will accept applications for the role until September 26, 2025.

Microsoft is an equal opportunity employer. Consistent with applicable law, all qualified applicants will receive consideration for employment without regard to age, ancestry, citizenship, color, family or medical care leave, gender identity or expression, genetic information, immigration status, marital status, medical condition, national origin, physical or mental disability, political affiliation, protected veteran or military status, race, ethnicity, religion, sex (including pregnancy), sexual orientation, or any other characteristic protected by applicable local laws, regulations and ordinances. If you need assistance and/or a reasonable accommodation due to a disability during the application process, read more about requesting accommodations (https://careers.microsoft.com/v2/global/en/accessibility.html) .