# HPC Network Engineer

**Company**: Fuse Energy
**Location**: London, England
**Experience**: senior
**Job type**: full-time
**Category**: Engineering
**Industry**: Technology

**Apply**: https://jobs.workable.com/view/pMVNMTab7rBAJHo9dCXHrn/hpc-network-engineer-in-london-at-fuse-energy?utm_source=yubhub.co&utm_medium=jobs_feed&utm_campaign=apply
**Canonical**: https://yubhub.co/jobs/job_6ba89fb6-910

## Description

Fuse Energy is an AI-first energy company on a mission to make energy abundant and affordable, fast. They combine first-principles thinking with cutting-edge technology to build a radically better energy system.

You'll design, deploy and operate the network fabric for their multi-tenant AI cluster: the high-performance compute and storage fabrics carrying RDMA traffic between GPUs, the tenant-facing and management networks, firewalling and tenant isolation, and the out-of-band infrastructure that keeps it all recoverable.

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 catch congestion and link degradation before tenants do

- 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 office-to-data-centre connectivity

- Upskill colleagues on networking through documentation, run-throughs and pairing

Requirements:

- 5+ years as a network engineer operating production data centre networks

- Strong dynamic routing experience (BGP in particular), plus overlay/encapsulation design and troubleshooting (e.g. EVPN/VXLAN)

- Hands-on experience with leaf-spine / Clos fabric design and operation

- Experience with modern data centre network operating systems and comfortable in the Linux networking stack, not just a vendor CLI

- Practical RDMA fabric experience: lossless Ethernet (e.g. RoCEv2 with PFC/ECN/DCQCN tuning) or InfiniBand, understanding why lossless behaviour matters for GPU workloads

- Network automation as a working practice: scripting (e.g. Python), configuration management (e.g. Ansible), config generation from a source of truth, version-controlled changes

- Solid Linux administration fundamentals: you can debug from the host side as well as the switch side

- Experience with network telemetry and monitoring (e.g. Prometheus/Grafana, sFlow/IPFIX, streaming telemetry)

- Experience running corporate/campus networks: wired and wireless, switching, NAC/802.1X, VPN and remote access

- Clear communicator who enjoys teaching

Benefits:

- Competitive salary and eligibility for equity

- Biannual bonus scheme

- Fully expensed tech to match your needs

- Private health insurance

- Breakfast and dinner allowance for office-based employees

## Skills

### Required
- RDMA
- RoCEv2
- InfiniBand
- BGP
- EVPN/VXLAN
- Ansible
- Python
- NetBox
- Linux
- Prometheus/Grafana
- sFlow/IPFIX
- streaming telemetry

### Nice to have
- GPU cluster networking
- NVIDIA Spectrum-X or Quantum InfiniBand
- ConnectX/BlueField NICs and DPUs
- UFM
- SHARP
- container networking
- CNI
- BGP integration
- collective-communication libraries
- multi-tenant VRF-based isolation
- enterprise firewalls
- FortiGate
- Palo Alto
- storage networking
- NVMe-oF
- bare-metal provisioning
- MAAS
- PXE
- Redfish
- optical layer at 200/400/800G
- greenfield data centre network build
- CCNP/CCIE or equivalent

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Source: [Apply at jobs.workable.com](https://jobs.workable.com/view/pMVNMTab7rBAJHo9dCXHrn/hpc-network-engineer-in-london-at-fuse-energy?utm_source=yubhub.co&utm_medium=jobs_feed&utm_campaign=apply)