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Cosmic Labs

Senior HPC Engineer (GPU)

Cosmic Labs, New York

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We're looking for an engineer who can solve real-world infrastructure problems — someone who’s tuned GPU workloads at scale, debugged fabric congestion under pressure, and understands the nuances of RDMA and packet-level performance.

If you've built or supported high-performance environments at organizations like AWS, Azure, GCP, Equinix, Digital Realty, or a national lab, we want to talk. No visa sponsorship.

What You’ll Do

  • Triage and solve performance issues across GPU clusters, multi-node networks, and scheduler queues
  • Tune traffic flows using RDMA, TCP/IP, custom congestion control
  • Improve workload orchestration and maximize GPU utilization in volatile, high-throughput environments
  • Build tooling and telemetry for packet routing, pacing, jitter analysis, and node-level health
  • Work cross-functionally to help our protocol engine make smart, real-time decisions across cloud and bare metal

What We’re Looking For

  • Experience running or tuning infrastructure at scale (bonus if from AWS, Azure, GCP, Equinix, Digital Realty, national labs, or HPC clusters)
  • Strong understanding of GPU cluster orchestration (e.g., Slurm, Kubernetes, MIG)
  • Deep knowledge of networking for AI: RDMA, NCCL, TCP/UDP tuning
  • Comfort with low-level debugging: tcpdump, perf, custom scripts, and cluster logs
  • Background in HPC, AI infrastructure, trading, or large-scale distributed systems is a MUST
  • Excited to help build something fundamentally better than existing networking models

Our Stack Includes

  • Linux (bare metal and cloud), NVIDIA and AMD GPUs
  • No reliance on SmartNICs, custom silicon, or proprietary hardware

About Us

We’re building a new software layer that makes networks intelligent—capable of real-time path selection, pacing, and failover without hardware changes. Our early deployments focus on AI infrastructure, trading systems, and national security environments. We’re backed by leading investors and actively expanding our engineering team.

If you’re ready to help make compute faster, smarter, and more deterministic, we’d love to hear from you.

Seniority level

  • Seniority level

    Mid-Senior level

Employment type

  • Employment type

    Full-time

Job function

  • Job function

    Engineering and Information Technology

  • Industries

    Software Development

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