Software Engineer, Compute Infra

San Franciscofull timeOn Site

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Cursor Software Engineer on Compute Infra at SpaceXAI building sandbox infrastructure for agent VMs, including virtualization, control plane scaling, and networking. Responsible for developing cloud infrastructure supporting millions of CPU cores across datacenters.

Responsibilities

As a Software Engineer on Compute Infra at SpaceXAI, you'll build the sandbox infrastructure to give every agent their own VM. These VMs power coding agents, Grok Bot, reinforcement learning, and more. We operate one of the largest set 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.
Rearchitecting the control plane / scheduler to support 1 million concurrent VMs per cluster.
Building a ublk block device that can dedupe, lazy load, and efficiently snapshot VM data.
Designing an egress proxy and network isolation to securely filter, monitor, and route agent traffic.
Designing resilient systems that can operate across a mixture of cloud and on-premise datacenters.

Qualification

Bachelor's degree in computer science

Required

Bachelor's degree in computer science, engineering, math, or scientific discipline; OR 2+ years of professional experience building software in lieu of a degree
You enjoy thinking about infrastructure primitives that future agents will require.

Preferred

Experience building compute orchestration (e.g. Kubernetes, Mesos)
Experience building and operating large fleets of VMs / isolated sandboxes
Experience with Linux kernel and virtualization technologies

Company

Cursor

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Source: ashby

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Must-Have Skills for This Role

FirecrackerCloud HypervisormicroVMsvirtualizationLinux kernelKubernetes

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Software Engineer, Compute Infra at Cursor · LumiJobs