Staff HPC Network Architect

*Note: This position requires presence in our San Jose, San Francisco, or Bellevue office location 4 days per week; Lambda’s designated work from home day is currently Tuesday., * Architect high-performance networking solutions that power cloud platforms, with a focus on ultra-low-latency and high bandwidth connectivity.

• Define the network topology and architectural patterns for large scale GPU clusters, storage backends, and multi tenant environments.
• Evaluate, benchmark, and select next generation network technologies (e.g., InfiniBand NDR/XDR, RoCE, 400G 1.6T Ethernet, Ultra Ethernet, ESUN, OCI, etc) to meet AI workload requirements.
• Develop and maintain network architecture standards, reference designs, and scalability roadmaps for multi site and hybrid environments.
• Partner with compute and storage architects to ensure seamless end to end data flow and fault tolerance.
• Guide network automation strategies and tooling to enable efficient provisioning, telemetry, and operational visibility.
• Mentor engineers and cross functional teams on advanced network concepts, troubleshooting, and architectural best practices.

• Proven experience (7+ years) architecting high performance data center networks, preferably for HPC, AI/ML, or large scale cloud infrastructure.
• Deep expertise with InfiniBand (HDR/NDR) and advanced Ethernet fabrics, including RoCE and RDMA protocols.
• Strong understanding of data center switching architectures, congestion control (PFC, ECN), QoS, and network virtualization technologies such as VXLAN and EVPN.
• Skilled in designing for low latency and high throughput data paths, including GPU to GPU and storage traffic optimization.
• Expertise with BGP based fabric design, including eBGP underlays, MP BGP EVPN, ECMP, route policy, and convergence.
• Experience with SDN, APIs, automation, and network telemetry.
• Strong optical networking competency, including transceiver technologies, fiber types and topologies, link budgets, breakout architectures, and WDM.
• Experience building resilient, fault tolerant high performance network architectures with redundancy, failover, and high availability.
• Excellent communication and leadership skills, capable of influencing technical decisions across diverse teams.
• Strong ownership and can do attitude, self starter who feels comfortable working in ambiguity., * Hands on experience with AI workload profiling, collective communication patterns (e.g., NCCL, MPI), and network tuning for distributed training.
• Familiarity with network automation frameworks and telemetry tools.
• Exposure to DPU/SmartNIC technologies, including NVIDIA BlueField, or similar.
• Knowledge of large scale, multi site interconnect design, including DWDM or metro/long haul networking.
• Experience collaborating with hyperscale or enterprise customers on highly customized network designs.

• Our values are publicly available: careers
• We offer generous cash & equity compensation
• Health, dental, and vision coverage for you and your dependents
• Wellness and commuter stipends for select roles
• 401k Plan with 2% company match (USA employees)
• Flexible paid time off plan that we all actually use

Lambda, The Superintelligence Cloud, is a leader in AI cloud infrastructure serving tens of thousands of customers. Our customers range from AI researchers to enterprises and hyperscalers. Lambda’s mission is to make compute as ubiquitous as electricity and give everyone the power of superintelligence. One person, one GPU.

If you’d like to build the world’s best AI cloud, join us., * Founded in 2012, with 500+ employees, and growing fast

• Our investors notably include TWG Global, US Innovative Technology Fund (USIT), Andra Capital, SGW, Andrej Karpathy, ARK Invest, Fincadia Advisors, G Squared, In Q Telescope (IQT), KHK & Partners, NVIDIA, Pegatron, Supermicro, Wistron, Wiwynn, Gradient Ventures, Mercato Partners, SVB, 1517, and Crescent Cove