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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 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.

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 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 infrontendengineering, 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,leveragingreal-world telemetry, experimentation, and diagnostics to continuouslyoptimizeresponsiveness, accessibility, and reliability—using metrics like UPLT and live site dashboards tovalidateimprovements.

+ You will mentor engineers and foster a culture of technical excellence through best practices infrontendarchitecture, performance profiling, telemetry integration, 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.

+ 2+ years experience in modernfrontendtechnologies including React, Typescript, and with a strongtrack recordof deliveringperformant, accessible, and scalable experiences in production.

+ 2+ years of experience in engineering with a data‑centric approach that integrates usage analytics and experimentation into planning, design, and iteration to drive measurable business impact.

Preferred Qualifications:

+ Customer‑obsessed and passionate about product impact, with a focus on using data insights to inform decisions and improve user experience.

+ Experience applying a data-driven approach to engineering, including performance telemetry, experimentation frameworks, and analytics pipelines; familiarity with Azure Data Factory or similar ETL technologies for integrating and transforming performance data at scale.

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

+ 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.

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 November 14, 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) .