Our team is responsible for the core systems that power [Microsoft 365 Copilot Chat](https://support.microsoft.com/en-us/copilot-microsoft365-chat) delivering intelligence, quality, and transformative new features. We work at the intersection of research and engineering—advancing orchestrator reasoning, training next-generation models, and shipping impactful, model-driven experiences in Microsoft 365 Copilot.
As a Principal Applied Scientist - Microsoft 365 Copilot, you will:

• Evolve our orchestrator to reason more effectively, respond faster, and support new capabilities in multi-modality, agent-based systems, and beyond
• Advance the state of the art in model training—including post-training methods such as fine-tuning and reinforcement learning, high-quality data curation, and experimentation with frontier model training
• Build and deliver model-driven features from concept to production—spanning model development, evaluation, metrics, and A/B testing

Recent launches like [Analyst Agent in Microsoft 365 Copilot | Microsoft Community Hub](https://techcommunity.microsoft.com/blog/microsoft365copilotblog/analyst-agent-in-microsoft-365-copilot/4397191) showcase the breadth and depth of impact you’ll help drive across the stack.

This role requires you to be onsite 3 days a week in Microsoft's offices in Redmond, WA.  
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.