Principal Software Engineer - M365 Copilot App
 Microsoft | |
 United States, California, Mountain View | |
 Oct 24, 2025 | |
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OverviewAI is transforming productivity in profound ways. As the new home of Office productivity, the M365 Copilot App (M3CA) is at the forefront of this transformation. It is one of the fastest growing products at Microsoft, and the primary means through which most M365 users experience the power of Copilot - be it Chat, Search, or Agents. M3CA is a multi-platform product, built for consumer-grade experiences and enterprise-grade trust. Our team is responsible for all aspects of engineering for this ecosystem of applications and services. As a Principal Software Engineer - M365 Copilot App on the team, you will be responsible for designing, building and running the Copilot application across Windows, Mac, and Web platforms. You will lead architectural decisions and contribute hands-on code to build applications, balancing innovation with platform stability. You will work closely with other engineers to take ideas through design, implementation, validation, and release. You will write secure, reliable, scalable code as well as test automation and telemetry to measure its behavior in production. You will work in a fast paced, collaborative environment to design, prototype, implement, and ship features. You will partner across multiple product and platform teams in Microsoft and define reusable architectural patterns and techniques that enable consistent and intelligent user experiences at scale. You will mentor engineers and foster a culture of technical capabilities in architecture, performance profiling, and cross-platform design systems. You will provide engineering leadership to the team taking on technical issues inherent in building and delivering a consumer-grade application that powers cross-platform AI experiences.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.
ResponsibilitiesPartners with appropriate stakeholders to determine user requirements across different scenarios.Leads identification of dependencies and development of design documents for the application and service.Assists others to produce extensible and maintainable code used across products.Leverages subject-matter knowledge of cross-product features with appropriate stakeholders (e.g., project managers) to drive multiple group's project plans, release plans, and work items.Guides and mentors engineers across the team, working on-call to monitor the product for degradation, downtime, or interruptions.Seeks new knowledge and adapts to new trends, technical solutions, and patterns that will improve the availability, reliability, efficiency, observability, and performance of the product while also driving consistency in monitoring and operations at scale and shares knowledge with other engineers.Embody our culture and values. | |