Senior HPC Network Engineer – RDMA & GPU Clusters

Multicoin; London; On-site; NOK 1,141,000 - 1,648,000; Full time

Benefits offered by this job

Competitive salary and equity sign-on

Biannual bonus scheme

Fully expensed tech to match your need

Breakfast and dinner allowance for off

Job summary

Fuse Energy is building a best-in-class network fabric for a multi-tenant AI cluster, spanning high-performance compute, storage, and management networks. You will own the fabric architecture through day-2 operations, including RDMA traffic and tenant isolation.

You’ll design, deploy, and operate leaf-spine data centre fabrics, automate provisioning, and build observability dashboards to detect congestion before tenants notice.

Qualifications

• 5+ years as a network engineer operating production data centre networks.
• Strong dynamic routing experience, esp. BGP; EVPN/VXLAN.
• Hands-on leaf-spine / Clos fabric design and operation.
• Proficient in Linux networking stack and modern data centre OS.
• RDMA fabric experience: lossless Ethernet or InfiniBand.
• Network automation with Python/Ansible and config-as-code.
• Solid Linux administration fundamentals and telemetry proficiency.
• Experience with Prometheus/Grafana and related telemetry.
• Experience with campus networks, NAC/802.1X, VPN access.
• Clear communicator who can teach and document.

Responsibilities

• Design and operate lossless, RDMA-capable fabrics (e.g. RoCEv2, InfiniBand) for GPU compute and storage traffic, including QoS, congestion control, and buffer tuning at scale
• Build and manage leaf-spine data centre fabrics, with routed underlay and overlay design (e.g. BGP, EVPN/VXLAN)
• Implement and maintain per-tenant network isolation across compute, storage, and management planes.
• Automate network provisioning, configuration, and validation, treating switch config as code (e.g. Ansible, Python, NetBox as source of truth), deployed through CI
• Build telemetry and observability for the fabric: flow-level and buffer-level visibility, dashboards, and alerting that catches congestion and link degradation before tenants do (e.g. Prometheus/Grafana/Datadog, streaming telemetry)
• Troubleshoot performance issues end to end, from optics and cabling through switch buffers to NIC/DPU configuration and collective-communication behaviour on the hosts
• Operate the out-of-band management network, console access, and remote recovery paths
• Support tenant onboarding: segmentation and addressing, bandwidth and isolation guarantees, and capacity planning as the cluster scales
• Write clear design documentation capturing decisions, rationale, and rejected alternatives
• Own and maintain the office network: wired and wireless infrastructure, firewalling, VPN/remote access, and connectivity between the office and data centre environments
• Upskill colleagues on networking: share knowledge through documentation, run-throughs, and pairing so the wider team can operate and troubleshoot the fabric confidently

Skills

BGP routing

EVPN/VXLAN

Leaf-spine design

Linux networking

Automation

RDMA fabric

Ansible

Python

Telemetry

Tools

NetBox

Prometheus

Grafana

InfiniBand

Job description

Fuse Energy is building a best-in-class network fabric for a multi-tenant AI cluster, spanning high-performance compute, storage, and management networks. You will own the fabric architecture through day-2 operations, including RDMA traffic and tenant isolation.

You’ll design, deploy, and operate leaf-spine data centre fabrics, automate provisioning, and build observability dashboards to detect congestion before tenants notice.