Staff HPC Network Architect

lambda; Manchester; Hybrid; GBP 106,000 - 159,000; Full time

Benefits offered by this job

Cash & equity compensation

Health, dental, vision coverage

Wellness and commuter stipends

401k with company match

Job summary

Lambda seeks a senior network architect to design high‑performance data center networks for AI/ML workloads. You will shape topology for GPU clusters, storage backends, and multi‑tenant environments, and select next‑gen technologies to meet demanding AI workloads.

You will lead architecture standards, collaborate with compute and storage teams for end‑to‑end data flow, and guide automation and telemetry initiatives. Strong leadership and ownership are essential.

Qualifications

• 7+ years architecting high‑performance data center networks (HPC/AI/cloud).
• Deep InfiniBand HDR/NDR and Ethernet fabrics experience (RoCE, RDMA).
• Strong data center switching, congestion control, QoS, VXLAN/EVPN.
• Low-latency, high-throughput data paths including GPU‑to‑GPU and storage traffic.
• BGP-based fabric design including eBGP underlays, EVPN, ECMP, route policy.
• Experience with SDN, APIs, automation, and network telemetry.
• Optical networking: transceivers, fiber types, topologies, WDM.
• Leadership and cross-functional influence; ownership mindset.

Responsibilities

• Architect high‑performance networking solutions with ultra‑low latency and high‑bandwidth connectivity.
• Define topology and patterns for large‑scale GPU clusters, storage backends, multi‑tenant environments.
• Evaluate and select next‑generation network technologies to meet AI workload requirements.
• Develop and maintain network architecture standards and scalability roadmaps.
• Partner with compute and storage architects for end‑to‑end data flow and fault tolerance.
• Guide network automation strategies and tooling for provisioning, telemetry, visibility.
• Mentor engineers on advanced network concepts and best practices.

Skills

InfiniBand HDR/NDR

Ethernet fabrics RoCE/RDMA

BGP EVPN

VXLAN EVPN

SDN & Automation

Low latency design

Leadership & communication

Ownership mindset

Tools

Automation tooling

Telemetry tools

NVIDIA BlueField

Job description

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.

*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.

What You’ll Do

• 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.

You

• 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.

Nice to Have

• 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.

Salary Range Information

The annual salary range for this position has been set based on market data and other factors. However, a salary higher or lower than this range may be appropriate for a candidate whose qualifications differ meaningfully from those listed in the job description.

About Lambda

• 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

• We have research papers accepted at top machine learning and graphics conferences, including NeurIPS, ICCV, SIGGRAPH, and TOG

• Our values are publicly available: https://lambda.ai/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

Equal Opportunity Employer

Lambda is an Equal Opportunity employer. Applicants are considered without regard to race, color, religion, creed, national origin, age, sex, gender, marital status, sexual orientation and identity, genetic information, veteran status, citizenship, or any other factors prohibited by local, state, or federal law.