Principal Software Engineer - CoreAI
 Microsoft | |
 United States, California, Santa Clara | |
 Oct 21, 2025 | |
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OverviewSoftware quality is being redefined by AI. As part of the Microsoft Playwright team, you'll build the foundation for how developers validate and trust the next generation of AI-assisted code. You'll work on open-source, cross-platform automation technology that powers reliable testing at scale across browsers, devices, and frameworks. You'll collaborate closely with the GitHub and VS Code teams to deliver fast, deterministic, and secure testing solutions that integrate deeply into the modern developer workflow and serve millions worldwide. As a Principal Software Engineer - CoreAI on the Playwright engineering team, you will design and implement systems that bring AI-native and agentic capabilities to test automation. You'll advance Playwright's runtime, infrastructure, and tooling to enable autonomous agents to reason about, generate, and validate software behavior. This opportunity will allow you to deepen your expertise in AI-assisted development, push the boundaries of intelligent automation with GitHub and VS Code, and expand your impact as a hands-on engineer defining the next era of software quality. Microsoft's mission is to empower every person and stronevery 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.
ResponsibilitiesLeads identification of dependencies and the development of design documents for a product, application, service, or platform. Leads by example and mentors others to produce extensible and maintainable code used across products. Leverages subject-matter expertise of cross-product features with appropriate stakeholders (e.g., project managers) to drive multiple group's project plans, release plans, and work items. Holds accountability as a Designated Responsible Individual (DRI), mentoring engineers across products/solutions, working on-call to monitor system/product/service for degradation, downtime, or interruptions. Proactively seeks new knowledge and adapts to new trends, technical solutions, and patterns that will improve the availability, reliability, efficiency, observability, and performance of products while also driving consistency in monitoring and operations at scale and shares knowledge with other engineers. | |