Microsoft Teams is the hub for modern collaboration—bringing together everything teams need to succeed, all within the Office 365 ecosystem. It serves as the canvas that unifies your content, tools, people, and conversations in one seamless experience. As one of Microsoft’s most dynamic and impactful products, Teams is redefining the future of teamwork—and we’re just getting started. Join us on this journey as we push the boundaries of what’s possible with Generative AI, Large Language Models (LLMs), and a world-class AI stack powering Teams Copilot and other cutting-edge AI experiences. You’ll be part of a team at the forefront of AI innovation, leveraging the latest in deep learning, natural language processing, and conversational AI to shape the future of work. Within the Messaging Services team, we’re evolving our microservices architecture to deliver new messaging capabilities while ensuring high performance, scalability, and cost efficiency. We’re looking for an experienced Principal Software Engineer to help us build robust, scalable backend services that power critical messaging experiences. This is a unique opportunity to sharpen your system design skills and work with a modern tech stack including .NET Core, TypeScript, Redis, and Azure Cosmos DB—all while collaborating across teams and organizations. 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.