Senior Windows Sandbox Engineer for AI Agent Platforms

Recruiting From Scratch; San Francisco (CA); On-site; USD 215,000 - 285,000; Full time

Benefits offered by this job

Equity

Job summary

Recruiting From Scratch is seeking a Senior Software Engineer to own the Windows Sandboxes stack. You will engineer the Windows guest stack on KVM/QEMU, develop virtio drivers and guest agents, and optimize boot and latency for instant-start sandboxes.

You will also build snapshot/fork features, APIs for AI agent interaction, and scalable image/update pipelines. You will work with a small, senior team on Linux virtualization, Windows internals, and AI agent infrastructure, shaping a serverless

Qualifications

• 5 years of professional systems, infrastructure, virtualization, or platform engineering experience.
• Hands-on production experience running Windows guests on Linux hypervisors such as KVM/QEMU.
• Strong understanding of Windows internals, including boot processes, services, session management, and the registry.

Responsibilities

• Build and productionize the Windows guest stack on KVM/QEMU infrastructure.
• Develop and integrate virtio drivers, guest agents, image pipelines, and unattended provisioning systems.
• Optimize Windows boot, session initialization, and login latency for instant-start sandboxes.
• Build snapshot, restore, pause, and fork capabilities for Windows VMs.
• Develop control-plane APIs for programmatic interaction with Windows environments.
• Build infrastructure for input injection, display streaming, file transfer, and lifecycle management.
• Automate Windows image creation, patching, Sysprep, and golden image management.
• Build scalable image update and deployment infrastructure across production fleet.
• Instrument Windows hosts to improve VM density, reliability, and cost per sandbox.
• Debug issues across KVM/QEMU, Windows kernel, services, drivers, and guest environments.

Skills

Go

Rust

C

C#

Tools

KVM/QEMU

virtio drivers

Job description

Recruiting From Scratch is seeking a Senior Software Engineer to own the Windows Sandboxes stack. You will engineer the Windows guest stack on KVM/QEMU, develop virtio drivers and guest agents, and optimize boot and latency for instant-start sandboxes.

You will also build snapshot/fork features, APIs for AI agent interaction, and scalable image/update pipelines. You will work with a small, senior team on Linux virtualization, Windows internals, and AI agent infrastructure, shaping a serverless