New 
Principal Software Engineer
 Microsoft | |
 United States, Washington, Redmond | |
 Oct 21, 2025 | |
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OverviewMicrosoft is at the forefront of a new era in productivity, and Microsoft 365 Copilot is redefining how we build and deliver AI experiences. We are a small, focused team within MSAI Office of the CTO (OCTO) committed to driving Copilot Agility - accelerating how we innovate, build, and scale the Copilot platform across Microsoft. We are looking for a Principal Software Engineer who combine deep technical experience in backend, data, and ML systems with a passion for agility and impact. In this role, you will design and lead the development of scalable systems and tools that accelerate Copilot engineering velocity across E+D (M365 Core, OPG, GXP, etc). You'll work closely with partners across product, data, and infrastructure to drive scalable-impact projects such as the Copilot Data Platform, while mentoring engineers and influencing technical direction across teams. You'll be working in an AI-native team, leveraging AI tools throughout the software development lifecycle.The qualified candidate is technically skilled, independent, and hands-on - someone who thrives in complex environments, ramps up quickly, and consistently delivers results. You'll play a key role in helping teams adopt agile development practices and accelerate AI-driven initiatives that power the next generation of Copilot experiences.If you're excited about improving how AI systems are built and delivered, and you want to make a visible impact on Microsoft's Copilot platform, this is the right role for you. 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.
ResponsibilitiesLead architectural design and discussions for core systems and platforms that improve the agility, performance, reliability, and efficiency of Copilot development.Drive identification of dependencies and development of technical design documents across products, applications, and services to ensure coherence and scalability of Copilot platform solutions.Define and implement quality strategies - mentoring others in test planning, validation, and success criteria to ensure resilient and scalable-quality software and service delivery.Establish and apply engineering metrics to drive quality, stability, and maintainability, while promoting established practices and reusable design patterns.Lead the creation and improvement of internal tools and frameworks that enhance developer velocity, automation, and overall system effectiveness.Collaborate closely with engineers, technical program managers, and partner teams across product, infrastructure, and research to deliver enterprise-grade solutions adopted at scale across E+D and Microsoft.Embody our culture and values. | |