Senior Network Engineer - GPU Cluster Networking

Senior Network Engineer - GPU Cluster Networking

The Role

We are seeking a Senior Network Engineer to join the AMD IT System Engineering team. This role is responsible for the architecture, deployment, optimization, automation, and production operation of high-performance backend networks supporting large-scale AMD GPU clusters. The engineer will own the network path from the GPU server and NIC through the data center switching fabric, ensuring that distributed AI training, large language model, inference, and HPC workloads receive predictable bandwidth, low latency, and reliable collective communication performance.

The Person

You are a highly experienced, hands-on network engineer with deep expertise in data center networking, RDMA, RoCEv2, and large-scale GPU cluster fabrics with approximately 10,000 or more GPUs.

You understand how distributed GPU workloads generate traffic across the backend network and how application performance is affected by network topology, congestion, GPU-to-NIC locality, routing, switch buffering, traffic-class configuration, and collective communication patterns. You take responsibility for end-to-end outcomes, including architecture, implementation, qualification, production deployment, monitoring, incident response, capacity planning, and continuous improvement. You use telemetry and repeatable performance testing to validate designs and make data-driven engineering decisions.

You are comfortable leading complex technical initiatives, mentoring engineers, documenting architecture and operating standards, and working across globally distributed organizations.

Key Responsibilities

• Architect, deploy, operate, and continuously improve high-performance backend networks for large-scale AMD Instinct GPU clusters.
• Design network fabrics capable of supporting AI and HPC environments ranging from individual GPU racks to clusters containing 10,000 or more GPUs.
• Own the backend network architecture from the GPU server and network interface card through the leaf-spine switching fabric.
• Design and optimize high-speed Ethernet fabrics using RoCEv2 and 100/200/400 GbE technologies.
• Develop scalable network topologies, including leaf-spine, Clos, fat-tree, rail-optimized, multi-plane, and non-blocking fabric architectures.
• Perform network topology modeling, oversubscription analysis, traffic-flow analysis, bandwidth planning, port-capacity planning, failure-domain analysis, and long-term growth forecasting.
• Configure, tune, validate, and troubleshoot lossless or near-lossless RoCEv2 environments, including PFC, ECN, DCQCN, QoS, ECMP, Switch buffer and queue management, DSCP and priority mappings
• Design and operate routing and switching environments using technologies such as BGP, ECMP, VLAN, VRF, EVPN, and VXLAN.
• Optimize end-to-end communication performance across GPUs, NICs, switches, CPUs, PCIe devices, storage systems, and the Linux networking stack.
• Lead production incident response, root-cause analysis, corrective actions, and preventive engineering improvements for GPU cluster networks.
• Plan and execute network expansions, cluster scale-outs, switch replacements, capacity upgrades, and fabric migrations

Preferred Experience

• Significant experience designing, deploying, and operating production data center networks for AI, GPU, HPC, cloud, or other large-scale distributed computing environments.
• Experience designing, scaling, or operating backend network infrastructure for GPU clusters containing approximately 10,000 or more GPUs, or similarly sized hyperscale compute environments.
• Deep knowledge of data center networking fundamentals; Routing and switching, VLANs and subnetting, BGP and ECMP, Quality of Service, MTU configuration, Switch buffering, Network segmentation
• Strong hands-on experience with RDMA and RoCEv2 in production environments.
• Demonstrated experience configuring, tuning, and troubleshooting PFC, ECN, DCQCN, QoS, switch buffers, NIC queues, RDMA traffic classes, and lossless or near-lossless Ethernet.
• Strong understanding of leaf-spine, Clos, fat-tree, rail-optimized, and multi-plane network architectures.
• Experience with network routing technologies such as BGP and ECMP and overlay technologies such as EVPN and VXLAN.
• Strong understanding of GPU cluster topology, including GPU-to-GPU, GPU-to-NIC, CPU-to-NIC, PCIe, NUMA, and network locality.
• Experience building monitoring and observability solutions usi…