Network Engineer

Network Engineer - High-Performance Computing & Cloud InfrastructureLocation: Remote (US)Base: $160,000–$190,000 + Bonus + Equity (RSUs - 4-year vest)The ClientI'm working with a neocloud building purpose-built GPU infrastructure for AI workloads. They run large-scale clusters powering training and inference for some of the most demanding AI customers in the market.The roleThey're hiring a Network Engineer to design, build, and operate the network fabric behind their GPU cloud. This is a hands-on engineering role at the centre of a fast-moving buildout: multi-site data centres, new NVIDIA and AMD GPU clusters, and a greenfield cloud platform with automation-first network design.You'll work across the whole stack from Juniper edge routing and firewalling, to leaf-spine fabrics on NVIDIA/Mellanox Cumulus and Arista, to the RDMA fabrics (InfiniBand and RoCE) that make large-scale training and inference possible. You'll spend as much time in automation and code as on the CLI, and you'll make trips to the data centres to help bring new capacity online.What you'll ownDesign, configuration, deployment, and tuning of high-speed network infrastructure for GPU training and inference across our clustersThe GPU fabric itself: RDMA over InfiniBand and RoCEv2 - congestion control, PFC/ECN tuning, and Pkey/partitioning for multi-tenant isolationEdge routing, firewalling, and multi-homed connectivity on Juniper: BGP, public IP space, and upstream carrier relationshipsLeaf-spine data centre fabrics on NVIDIA/Mellanox Cumulus Linux, and AristaNetwork automation and infrastructure-as-code: codifying device configs, fabric buildout, and validation in Python, Ansible, and Terraform rather than keeping it in people's headsObservability and troubleshooting across Prometheus, Grafana, Checkmk, Wireshark, and tcpdump, with a clear point of view on what good monitoring looks likeNetwork security posture alongside our security engineers: firewall policy, IDS/IPS, WireGuard VPN, and controls that hold up to SOC 2 and HIPAAData centre design: structured fibre and copper cabling, and physical-layer troubleshooting during new site and cluster buildoutsWhat they're looking forRequiredSignificant experience designing, operating, and troubleshooting production network infrastructure at scaleDeep understanding of TCP/IP, BGP, VLANs, VXLAN/EVPN, and modern data centre fabric designHands-on high-performance networking for HPC or AI/ML: RDMA, InfiniBand and/or RoCE, and the tuning that makes them performProduction experience with NVIDIA/Mellanox Cumulus Linux and/or Arista EOS in leaf-spine topologiesStrong Juniper routing and firewall experience (Junos)Fluency with network automation and IaC: Python, Ansible, Terraform, and BashComfortable with packet-level troubleshooting (Wireshark, tcpdump) and metrics-based troubleshooting (Prometheus, Grafana)Non-essential but nice to have:Building or operating GPU/HPC network fabrics at scale (ConnectX, Bluefield DPU, Spectrum, Quantum, UFM, or equivalent)Familiarity with SDN and network-automation platforms (e.g. Netris or comparable)OpenStack/OVN networking, or standing up SDN on a greenfield cloud platformWorking knowledge of NVIDIA GPU platforms (H100, B200) and their InfiniBand scale-out networkingExposure to AMD GPU platforms (MI-series) and their Ethernet scale-out networkingZero-trust network design and WireGuard VPNOperating under SOC 2 and/or HIPAAMAAS or bare-metal provisioningIf you're interested in finding more out about the role - submit your resume and I'll be in touch to the successful applicants.