Software Engineer, Compute Infra
Cursor, San Francisco, CA +1
The role
As a Software Engineer on Compute Infra at SpaceXSI, you'll build the sandbox infrastructure that gives every agent its own VM. These VMs power coding agents, Grok Bot, reinforcement learning, and more. We operate one of the largest sets of sandbox clusters in the world, at millions of CPU cores, across third- and first-party datacenters. You'll own developing a cloud for agents, including the virtualization layer (Firecracker and Cloud Hypervisor microVMs), control plane scaling, and the networking/connectivity layer on top.
What you will do
- Rearchitect the control plane and scheduler to support 1 million concurrent VMs per cluster
- Build a ublk block device that can dedupe, lazy load, and efficiently snapshot VM data
- Design an egress proxy and network isolation to securely filter, monitor, and route agent traffic
- Design resilient systems that can operate across a mixture of cloud and on-premise datacenters