The M365 Copilot RAG team is building the next generation of intelligent assistant systems to empower enterprise users with advanced productivity capabilities. We are hiring multiple Applied Scientists to join our efforts in enterprise-grade search, agentic RAG and multi-agent orchestration. This role will directly contribute to the core capabilities of Copilot and impact how millions of users interact with their enterprise data. Our team is composed of world-class scientists and engineers who are passionate about turning cutting-edge research into high-quality, scalable products and services. We are hiring Principal Applied Scientist. **Responsibilities** • Design and develop sub-agents for search, find, and related tasks over complex enterprise private data with diverse types and heavy schema. • Architect and optimize core algorithms for RAG systems, including retrieval, ranking, and grounding extraction. • Lead the efforts exploring novel task decomposition and execution strategies within multi-agent collaboration frameworks. • Analyze offline and online performance signals to identify optimization opportunities and improve user experience and system efficiency. • Collaborate closely with product and platform teams to deliver robust, scalable solutions. **Qualifications** • Master’s, or PhD degree in Computer Science or related fields. • Strong algorithmic and modeling skills, with solid problem-solving capabilities. • Academic background in NLP, RL, search, or recommendation systems is preferred. • Demonstrated rich experience on complex document understanding, RAG frameworks, and multi-agent orchestration is a strong plus. • Excellent communication and collaboration skills, with the ability to thrive in cross-functional environments. Microsoft is an equal opportunity employer. Consistent with applicable law, all qualified applicants will receive consideration for employment without regard to age, ancestry, citizenship, color, family or medical care leave, gender identity or expression, genetic information, immigration status, marital status, medical condition, national origin, physical or mental disability, political affiliation, protected veteran or military status, race, ethnicity, religion, sex (including pregnancy), sexual orientation, or any other characteristic protected by applicable local laws, regulations and ordinances. If you need assistance and/or a reasonable accommodation due to a disability during the application process, read more about requesting accommodations (https://careers.microsoft.com/v2/global/en/accessibility.html) .