As part of the M365 Copilot team, we are building enterprise-grade agentic web infrastructure, enabling advanced browser and search tools for both public and private web ecosystems. As the web remains the largest and most dynamic data source for AI, M365 Copilot requires solid infrastructure with the ability to retrieve, process, and ground information from the web with unprecedented accuracy, security, and compliance. The team's mission is to build this critical infrastructure to enable M365 Copilot to stay ahead of the competition. By leveraging Microsoft's infrastructure like Bing, open-source technologies, and learnings from industry leaders, we will build scalable, extensible, intelligent and high-quality services, all while adhering to enterprise security and compliance standards. This is a unique opportunity to shape the future of AI-powered web interaction and information retrieval at scale. **Responsibilities** Lead the design and development of advanced models and algorithms for web search and browsing, collaborate with cross-functional teams, and drive innovation in AI-powered information retrieval. **Qualifications** + PhD or MS in Computer Science, Machine Learning, or related field + 5+ years of experience in applied science or AI research + Proven expertise in developing and deploying AI/ML models + Strong background in information retrieval, NLP, or web data mining + Experience building large-scale AI applications (a big plus) + Excellent problem-solving and leadership skills 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) .