HPC Network Engineer: RDMA, Leaf-Spine & AI Fabric

Fuse Energy; Greater London; On-site; GBP 90,000 - 140,000; Full time

Benefits offered by this job

Biannual bonus

Fully expensed tech

Private health insurance

Breakfast and dinner allowance

Job summary

Fuse Energy is building a multi-tenant AI-enabled network backbone. You will design, deploy and operate lossless, scalable fabrics for GPU compute and storage, owning both data-centre and office networks.

Expect extensive automation, telemetry and cross-team collaboration to deliver high-performance, reliable networking at scale. The role requires 5+ years in production data-centre networks, strong BGP/EVPN expertise, and hands-on leaf-spine experience, with a focus on Linux, Ansible, Python and

Qualifications

• 5+ years experience designing and operating production data centre networks.
• Strong expertise in dynamic routing, especially BGP, and overlay/encapsulation (EVPN/VXLAN).
• Hands-on experience with leaf-spine/Clos fabric design and operation.

Responsibilities

• Design and operate lossless, RDMA-capable fabrics for GPU compute and storage traffic, including QoS and buffer tuning at scale.
• Build and manage leaf-spine data centre fabrics with routed underlay/overlay (BGP, EVPN/VXLAN).
• Implement and maintain per-tenant network isolation across compute, storage and management planes.
• Automate network provisioning, configuration and validation (Ansible, Python, NetBox) deployed via CI.
• Build telemetry and observability for the fabric (Prometheus, Grafana) with dashboards and alerts.
• Troubleshoot performance end-to-end from optics to NIC/DPU configuration and host behavior.
• Operate the out-of-band management network and remote recovery paths.
• Support tenant onboarding: segmentation, addressing, bandwidth guarantees and capacity planning.
• Write clear design documentation capturing decisions and alternatives.
• Own the office network: wired/wireless, firewalling, VPN and office-to-data-centre connectivity.
• Upskill colleagues on networking through documentation and pairing.

Skills

Network engineering

BGP

EVPN VXLAN

Leaf-spine design

RDMA fabrics

Linux

Python

Ansible

NetBox

Prometheus

Grafana

Tools

NetBox

Prometheus

Grafana

Ansible

PXE

MAAS

Job description

Fuse Energy is building a multi-tenant AI-enabled network backbone. You will design, deploy and operate lossless, scalable fabrics for GPU compute and storage, owning both data-centre and office networks.

Expect extensive automation, telemetry and cross-team collaboration to deliver high-performance, reliable networking at scale. The role requires 5+ years in production data-centre networks, strong BGP/EVPN expertise, and hands-on leaf-spine experience, with a focus on Linux, Ansible, Python and