New 
Principal Software Engineer - M365 Copilot App
 Microsoft | |
 United States, Washington, Redmond | |
 Oct 30, 2025 | |
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OverviewThe M365 Copilot App Platform team provides the platform APIs, infrastructure and backend services for the Microsoft 365 Copilot app (https://m365.cloud.microsoft). Partner teams have built their AI-enabled experiences on our platform and depend on us for their success. We own the full technology stack - including application code, platform APIs, deployment pipelines, infrastructure, backend web server, and middle-tier services - supporting the app across web, Windows, and Mac environments. We are seeking a highly skilled and motivated Principal Software Engineer to join our middle-tier service team within the M365 Copilot App Platform team. As a Principal Software Engineer, you will design, implement, and maintain scalable, secure, and reliable services that power AI-enabled experiences in Microsoft 365 Copilot across platforms. You'll collaborate with cross-functional teams in a fast-paced agile environment to drive innovation and improve performance and quality. This opportunity will allow you to deepen your expertise in service infrastructure, automation, and operational excellence while contributing to a product that is central to Microsoft's strategy in the AI space. 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.
ResponsibilitiesLead the design and implementation of new middle-tier features working with architects and other individual contributors.Develop and maintain the middle-tier, APIs, deployment pipelines, and infrastructure.Collaborate with cross-functional teams to enable the M365 Copilot app and drive innovation.Work closely with partner teams to build new additional capabilities into our application.Design, produce and deliver software to improve reliability, scalability, performance, security, efficiency, etc.Opportunity for full-stack development work that spans our client app and middle-tier services.Design and improve deployment, monitoring and recovery processes. Apply metric-driven approach to improve service quality and reduce customer-impacting incidents Monitor and maintain health of distributed services for high availability and resiliency. Partner with product and platform teams to align service architecture with business goals and other Microsoft services. Collaborate with software engineers to integrate reliability best practices into product design.Embody our culture and values. | |