Team Lead, Windows Sandboxes

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Title of the Role: Team Lead, Windows Sandboxes

Company Stage of Funding: Series A

Office Type: In Person

Company Description

We're representing a rapidly growing infrastructure company building the compute layer for AI agents. Its platform provides secure, isolated, instantly available sandboxes where AI agents can execute code, interact with computers, and run training workloads.

Following its Series A, the company has already grown 10x and is now expanding its infrastructure to support AI agents that need access to real Windows desktop environments. The team is tackling a largely unsolved infrastructure challenge: making isolated Windows virtual machines behave like serverless compute, with fast startup, snapshotting, pausing, forking, and efficient multi-tenant operation.

This is a deeply technical player-coach opportunity for an experienced infrastructure engineer to lead the Windows sandbox platform while remaining highly hands-on with the underlying systems.

• Own the architecture and delivery of the company's Windows sandbox runtime.
• Build and operate Windows guest environments on top of a KVM-based virtualization stack.
• Optimize Windows VM boot, provisioning, and login times to create an instant-start sandbox experience.
• Design infrastructure supporting snapshotting, pausing, restoring, and forking Windows virtual machines.
• Build scalable Windows image pipelines, including Sysprep and automated provisioning.
• Own virtio and driver integration across Windows guest environments.
• Develop reliable display and input streaming infrastructure for computer-use AI agents.
• Build automation around Windows services, registry configuration, WinRM, Power Shell, and unattended provisioning.
• Design a licensing-compliant architecture for multi-tenant Windows infrastructure while partnering with legal and finance on SPLA and BYOL requirements.
• Optimize sandbox density, infrastructure utilization, reliability, and cost per workload.
• Lead a small pod of senior infrastructure engineers while continuing to ship production code yourself.
• Hire, mentor, and unblock engineers while establishing the team's technical direction and engineering standards.
• Partner with Product on roadmap priorities and enterprise customer commitments.
• Own the production outcomes and long-term evolution of the Windows sandbox platform.

• 8+ years of professional systems, infrastructure, virtualization, or platform engineering experience.
• 2+ years of experience leading engineers responsible for production systems.
• Deep experience operating Windows infrastructure at scale outside of primarily Microsoft-native environments.
• Hands-on experience running Windows guests using KVM/QEMU.
• Strong experience with virtio drivers and Windows VM image automation.
• Deep understanding of Windows internals, including the boot process, services, registry, and system configuration.
• Experience automating Windows infrastructure using Power Shell, WinRM, unattended provisioning, or similar technologies.
• Strong systems programming ability with Go, Rust, C, or C++, or significant C#/Power Shell expertise combined with a systems programming language.
• Experience designing reliable, multi-tenant infrastructure with strong isolation requirements.
• Comfortable acting as a player-coach—leading a team while spending most of your time building alongside them.
• Pragmatic understanding of how technical, operational, and licensing constraints affect infrastructure architecture.
• High ownership mindset with the ability to take infrastructure from architecture through production operations.

• Background working on systems comparable to Windows 365, Azure Virtual Desktop, or large-scale remote workstation platforms.
• Experience with game…