Full-Time Principal Performance Engineer

• You will help set the performance strategy and lead investigations across layers (switch/silicon ↔ drivers ↔ AI/HPC workloads).
• Enable large-scale customer deployments across multiple verticals (cloud, autonomous, aerospace/defense, manufacturing, life sciences, climate).
• Partner directly with architecture, firmware, software, and lighthouse customers to raise the performance ceiling.

• Own pre- and post-launch performance validation, debugging, and optimization for adapters, switches, and fabric software.
• Lead performance for post-silicon bring-up validation of networking ASICs and end-products.
• Deliver customer support at scale: reproduce field issues, co-debug in shared/onsite labs, land mitigations and durable fixes, and publish per-customer tuning guides.
• Pathfind and optimize forward-looking workloads: drive research and enablement for AI inference, distributed AI training, and traditional HPC.
• Evaluate and tune Cornelis/Omni-Path, Ethernet/RoCEv2, and InfiniBand across topologies.
• Explore platform designs & tunings end-to-end: CPU/GPU NUMA placement, PCIe/GPU-Direct, BIOS/firmware, PTP/1588, switch/NIC QoS & scheduling.
• Design credible experiments: synthesize representative traffic, replay workload traces, and run on-cluster A/B tests with statistically sound comparisons.

• 10+ years in performance engineering, post-silicon/perf validation, or systems performance for high-speed networking or HPC/AI products.
• Post-silicon expertise: hands-on bring-up and performance validation of networking ASICs/systems.
• Demonstrated depth in networking hardware (switch/silicon) and software debug for performance tuning and issue resolution across production-scale deployments.
• Hands-on multi-fabric experience: Cornelis/Omni-Path, Ethernet/RoCEv2, and/or InfiniBand.
• AI/HPC workload fluency: NCCL/RCCL collectives, UCX/libfabric/MPI.
• Experimentation & analysis: workload modeling, on-cluster A/B tests, tail-latency analysis.
• Automation: Python + Linux; data pipelines, dashboards, and CI hooks to prevent performance regressions.
• Excellent cross-functional communication.
• BS/MS in CE/EE/CS (or equivalent experience).

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