Microsoft Ads powers one of the world’s largest digital advertising ecosystems, delivering billions of recommendations every day to users worldwide. We are seeking a Principal Architect to advance the next generation of distributed systems that power ad retrieval, ranking, moderation, and generation at web scale. You will also build evaluation frameworks, enable agentic platforms leveraging LLMs and SLMs to reason, adapt, and take multi-step actions, unlocking measurable impact for our advertisers and users.

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.