Vultr is on a mission to make high-performance cloud computing easy to use, affordable, and locally accessible.
GPU Fabric Engineer
Location
United States
Posted
2 days ago
Salary
$125K - $135K / year
Seniority
Senior
Job Description
GPU Fabric Engineer
Vultr
• Validate and troubleshoot InfiniBand and RoCE fabrics during GPU cluster bring-up and expansion • Tune fabric performance parameters for distributed AI workloads (NCCL, MPI, collective operations) • Monitor and manage fabrics using NVIDIA UFM (Unified Fabric Manager) for health, topology, and performance visibility • Diagnose and resolve fabric-level issues including link errors, congestion, packet loss, and path asymmetry • Optimize RDMA transport settings, PFC/ECN behavior, and lossless queue configuration for GPU traffic • Validate fabric performance benchmarks and ensure line-rate throughput for AI workloads • Collaborate with GPU Engineers to correlate fabric health with workload performance • Collaborate with networking teams on fabric provisioning, configuration, and remediation • Respond to fabric alerts and degradation events across production GPU clusters • Document fabric troubleshooting procedures, tuning parameters, and validation runbooks
Job Requirements
- 3–7 years of experience in network engineering, HPC fabric, or GPU infrastructure
- Hands-on experience with InfiniBand and/or RoCE fabrics in GPU cluster environments
- Experience with NVIDIA UFM for fabric management, monitoring, and diagnostics
- Strong understanding of RDMA transport, lossless Ethernet design, and congestion management (PFC, ECN, DCQCN)
- Experience with GPU cluster networking and distributed communication libraries (NCCL, MPI)
- Familiarity with GPU platforms and their interconnect requirements (NVIDIA NVLink, NVSwitch, ConnectX)
- Experience with fabric diagnostic tools (ibstat, ibqueryerrors, perfquery, etc.)
- Proficiency in Python or Bash for scripting and validation
- Basic understanding of Linux systems and server hardware
- Strong troubleshooting and analytical skills across network and system layers
Benefits
- 100% company-paid insurance premiums for employee medical, dental and vision plans.
- 401(k) plan that matches 100% up to 4%, with immediate vesting
- Professional Development Reimbursement of $2,500 each year
- 11 Holidays + Paid Time Off Accrual + Rollover Plan
- Increased PTO at 3 year and 10 year anniversary + 1 month paid sabbatical every 5 years + Anniversary Bonus each year
- $500 stipend for remote office setup in first year + $400 each following year
- Internet reimbursement up to $75 per month
- Gym membership reimbursement up to $50 per month
- Company paid Wellable subscription
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