Microsoft AI (MAI) is seeking experienced Platform Engineers to help build the next generation of Copilot, Microsoft's personal AI assistant. This role is part of Microsoft's ambitious vision to build true artificial intelligence systems across agents, applications, services, and infrastructure. The Platform Engineering team is crucial in developing APIs that support Copilot's core experience, including fine-tuning and deployment. The position requires extensive experience in C# development, distributed systems, and cloud infrastructure. Working in Microsoft's Redmond headquarters, you'll collaborate with Product Management, Design, and AI Research teams to push the boundaries of AI technology. The role offers competitive compensation ($161,600 - $286,200) and requires hybrid work arrangement with 3 days in office. This is an exceptional opportunity to work on cutting-edge AI technology while being part of Microsoft's mission to empower every person and organization on the planet to achieve more.