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The Fleet & Capacity organization within Microsoft 365 Core Platform is responsible for ensuring the right infrastructure is available in the right places at the right time to support Microsoft 365 services at hyperscale. The team drives capacity strategy, hardware platform readiness, fleet health, reliability engineering, lifecycle management, and operational excellence across Microsoft’s global cloud infrastructure. We are looking for a Principal Software Engineer - HW/SW in Fleet Infrastructure to provide technical leadership for the evolution of Substrate’s hardware and firmware platforms. In this role, you will shape New Product Introduction strategy, hardware and firmware health architecture, live-site reliability, and the future direction of AI-optimized infrastructure. You will work across Microsoft 365, Azure infrastructure, hardware engineering teams, silicon providers, OEM(original equipment manufacturer)/ODM (original design manufacturer) partners, and operations organizations to define architecture, influence platform strategy, and solve complex infrastructure problems at global scale. This role requires strong technical depth, architectural judgment, and the ability to create clarity across highly ambiguous, cross-organizational problems. Internal guidance for Principal engineers emphasizes broad scope, cross-team architecture leadership, strategic influence, and creating conditions for successful collaboration across teams. This position is based in Redmond, Washington and requires the employee be in the office a minimum of 3 days per week. 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.