Location: San Francisco or Croatia

Type: Full-time

Reports to: Engineering Lead, Windows Sandboxes

The role

You will make Windows behave like a serverless primitive: boot fast, snapshot instantly, fork on demand, and hand control to an AI agent over an API. This is unglamorous, high-leverage systems work at the intersection of Linux virtualization and Windows internals, and very few people in the world can do it well.

What You'll Do

• Build the Windows guest stack on KVM/QEMU: virtio drivers, guest agents, image pipelines, unattended provisioning
• Attack Windows boot and login latency; build snapshot/restore and fork that actually work for Windows guests
• Build the control plane surfaces agents use: input injection, display streaming, file transfer, process and app lifecycle APIs
• Automate image builds and updates: patching, software installation, sysprep, golden image management at fleet scale
• Instrument and improve density, cost, and reliability of Windows hosts
• Debug across the boundary: hypervisor on one side, Windows kernel and services on the other

What We're Looking For

• 5+ years of systems engineering in production
• Real experience with Windows guests on Linux hypervisors (KVM/QEMU + virtio) or equivalent depth in Windows virtualization internals
• Strong Windows internals: boot, services, session management, registry, PowerShell/WinRM automation
• Solid systems language skills (Go, Rust, C/C++, or C# where it counts)
• Ownership mentality; you run what you build