Network Engineer

The mission of Thinking Machines is to build AI that extends human will and judgment.

About the Role

We're looking for a network engineer to own the lowest layers of the network stack that our large-scale training and inference depend on. A single degraded link or flapping NIC can quietly slow a long training run or take it down outright; you'll be responsible for interconnect reliability at scale, across large GPU fabrics - both the RDMA/RoCE fabric between nodes and the NVLink/NVSwitch domains within them.

This is a hands-on, cross-stack role. You'll debug production collectives down to the NIC, build the instrumentation and tooling that makes the next debugging session dramatically faster, and serve as the technical point of contact who drives issues to resolution with our cloud providers' networking teams. Your goal is for our researchers to trust the fleet without worrying about the fabric underneath.

What You’ll Do

• Reason about and validate GPU network fabric design across our deployments.

• Debug RDMA / RoCEv2 across different NIC vendors. Diagnose collective failures of production NCCL, PFC/ECN tuning, and congestion control behavior.

• Own NVLink / NVSwitch interconnect - including fabric manager and IMEX health, link and lane errors, and how the GPU fabric interacts with collectives.

• Build host-level network instrumentation and use Linux tooling to build dashboards and alerts, not just the bug report.

• Navigate cross-cloud fabric quirks across providers and triage across the NIC, driver, kernel, switch, and workload boundaries.

• Drive escalations with cloud-provider networking teams, owning issues end-to-end until they're resolved.

Skills and Qualifications

Minimum qualifications:

• Bachelor’s degree or equivalent experience in computer science, engineering, or similar.

• Proficiency in at least one backend language (we use Python or Rust).

• Experience operating large-scale clusters and container orchestration systems (e.g. Kubernetes or Slurm).

• Comfort operating across the stack and owning projects end-to-end.

• Thrive in a highly collaborative environment involving many, different cross-functional partners and subject matter experts.

• A bias for action with a mindset to take initiative to work across different stacks and different teams where you spot the opportunity to make sure something ships.

Preferred qualifications - we encourage you to apply if you meet some but not all of these:

• Fluency with host-level debugging tools on Linux.

• Strong communication skills, internally and with cloud providers.

• Extensive experience with at least one of the following:

• Familiarity with cloud network primitives across at least two cloud providers.

• Hands-on experience with NVLink / NVSwitch, fabric manager, and IMEX.

• Statistical rigor in reliability reasoning - comfort reasoning about failure and error rates, distributions, and base rates, and the judgment to separate signal from noise when characterizing a large fabric.

• A track record of writing tooling that made the next debugging session meaningfully faster.

• Familiarity with CUDA/NCCL and performance profiling for distributed training and inference.

• Understanding of deep learning frameworks and their underlying system architectures.

Logistics

• Location: This role is based in San Francisco, California.

• Compensation: Depending on background, skills and experience, the expected annual salary range for this position is $350,000 - $475,000 USD.

• Visa sponsorship: We sponsor visas. While we can't guarantee success for every candidate or role, if you're the right fit, we're committed to working through the visa process together.

• Benefits: Thinking Machines offers generous health, dental, and vision benefits, unlimited PTO, paid parental leave, and relocation support as needed.