Principal Software Engineer-M365 Copilot

Microsoft is at the forefront of a new era in productivity, with Microsoft 365 Copilot redefining AI-powered experiences across work. The Copilot and Agents Core Office of the CTO shapes intelligent experiences across Microsoft 365 by bridging research and engineering, building core agent capabilities, incubating emerging technologies, and helping product teams scale high-quality AI features. We partner with engineers, researchers, and product teams to prototype bold ideas, validate them in real-world scenarios, and transition them into production-ready systems. Our culture values curiosity, accountability, collaboration, technical depth, user empathy, continuous learning, and open idea-sharing. By joining this team, you’ll help shape how Copilot and intelligent agents evolve across Microsoft and contribute to intelligent, contextual assistance for millions of users.

As a Principal Software Engineer, you will architect and lead the development of LLMs (Large Language Models) and the supporting subsystems that power product scenarios and GenAI capabilities across Microsoft 365 experiences. You will set technical direction, partner with research and engineering teams to deliver best-in-class solutions, align senior stakeholders, drive the design of custom LLM architectures for product needs, and design the backend, data, and ML systems that empower teams across the organization — while mentoring engineers and raising the technical bar.

The ideal candidate is an AI-forward technical leader who thrives in fast-paced, ambiguous environments, sets direction amid uncertainty, and delivers outsized impact through both hands-on engineering and technical leadership. If you’re passionate about building high-quality systems, solving complex technical problems, and elevating the engineers around you, this role is a strong fit.

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.