Principal Software Engineer, Experimentation Platform - CoreAI

CoreAI sits at the center of Microsoft’s mission to redefine how software is built and experienced, providing the foundational platforms, services, and developer experiences that power the next generation of AI-driven applications. As part of CoreAI, the Experimentation Platform (ExP) enables trustworthy, high-scale online experimentation that accelerates product learning and drives progress across Microsoft’s AI ecosystem. You will play a pivotal role in shaping the technical direction of systems that help teams ship better AI experiences faster by providing the experimentation capabilities needed to evaluate, refine, and safely deploy new innovations. In this role, you will lead the architecture and development of one of the highest-scale experimentation platforms - critical infrastructure that enables rapid iteration in AI systems and product features across Microsoft. You will drive the technical vision for services that empower engineers and scientists across the company to measure impact, validate hypotheses, and advance state-of-the-art AI capabilities through rigorous experimentation. This is an opportunity to lead complex, cross-team technical initiatives while shaping the future of distributed systems architecture, service reliability, and experimentation methodologies at Microsoft scale. You will thrive in this role if you are a technical leader who enjoys driving architecture decisions across teams, mentoring senior engineers, and building the reliable infrastructure foundations that accelerate Microsoft’s progress in AI.