Principal Software Engineer

As AI reshapes how software is built and defended, Microsoft Security is standing up a new Engineering Excellence organization that will define what world-class security engineering looks like in the agentic AI era. Engineering teams that lead in the AI era are organized around outcomes, built on shared platforms any team can draw from, and augmented by agents that are part of the daily workflow. Governance runs at the speed of development. This organization will build that foundation for Microsoft Security, and in doing so, help define what engineering excellence looks like at AI scale.  Our mission, is to build and scale core product-making systems that transform developer and builder productivity and enable AI-assisted workflows across Microsoft Security. We are looking for a Principal Software Engineer. The ideal candidate brings deep expertise in developer platforms and large-scale engineering infrastructure, with ability and passion to drive AI engineering workflows and outcomes rather than isolated experiments. They should understand the SOTA on agent-based systems, human-in-the-loop design. They should be comfortable to operate across complex codebases, tooling ecosystems, and infrastructure layers. Candidates for this role should hold a very high bar for engineering excellence. The right person will not simply build tools but create systems that change how product making gets done at scale. They should demonstrate strong judgment, technical depth, bias for action, drive for quality, reliability, and velocity. Excellence here means choosing people who can turn ambiguous productivity problems into reusable capabilities, measure their impact, and create feedback loops that continuously improve the engineering system. 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.