New 
Senior Software Engineer
 Microsoft | |
 United States, Washington, Redmond | |
 Oct 16, 2025 | |
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OverviewThe M365 Copilot App Platform team is the team that provides the platform APIs, infrastructure and backend web server for the Microsoft 365 Copilot app (https://m365.cloud.microsoft). All partner teams have built their AI-enabled experiences on our platform and depend on us for their success. Our team is responsible for the entire technology stack, including application code, platform APIs, deployment pipelines, infrastructure, backend web server, and middle-tier services that support the application across web, Windows, and Mac environments. We are seeking a highly skilled and motivated Senior Software Engineer to join our middle-tier service team within the M365 Copilot App Platform team. This team is responsible for providing the middle-tier service for Microsoft 365 Copilot web, Windows, and Mac apps which all build AI-enabled experiences within the application depend on. As a Senior Software Engineer, you will play a crucial role in developing and maintaining the middle-tier service code, deployment pipelines, and infrastructure. You will ensure the reliability, scalability, and security of the middle-tier service. The role focuses on designing, implementing and maintaining service infrastructure, automation, and operational excellence. You will work in a fast-paced agile environment, collaborating with cross-functional teams to enable the M365 Copilot app and drive innovation. If you are passionate about AI and services and have a strong technical background, this is an excellent opportunity to make a significant impact. In this role, you will work closely with partner teams to build new additional capabilities into our platform. You will also work to help improve the application's performance and quality. The M365 Copilot App is a key component in our strategy to compete with ChatGPT, making this position critical to our success. 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 | |