Stephen Hufnagel is a Principal Software Engineer with over a decade at Microsoft focused on hypervisor and subsystem engineering, currently driving core development for the Microsoft Hypervisor, Windows Hypervisor Platform, and Windows Subsystem for Linux. He designs and implements low-level virtualization features—arm64 ports, trusted launch, VTLs, guest VSM scenarios, interrupt handling, and nested virtualization—while co-authoring specifications and tooling for kernel and hypervisor refactoring. His background began in test and validation, which informs a relentless emphasis on test infrastructure, quality, and deployment automation across complex kernel and platform stacks. A practiced mentor and hiring contributor, he also champions diversity, inclusion, and a growth mindset within engineering teams. Based in the Greater Seattle Area, he brings systems programming expertise in C, C++, and assembly and a rare combination of deep kernel-level craftsmanship with pragmatic test-driven delivery.
10 years of coding experience
10 years of employment as a software developer
Bachelor of Science (B.S.) Computer Science, Bachelor of Science (B.S.) Computer Science at University of Michigan
Contributions:406 comments, 75 issues in 5 years 7 months
wslwindows
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Stephen Hufnagel - Principal Software Engineer at Microsoft