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About the Role

Design, deploy, and operate the network fabric for an AI cluster, covering high-performance compute and storage, tenant-facing networks, firewalling, and out-of-band infrastructure. Also responsible for the office network and acting as the company's networking authority.

Responsibilities

• Design and operate lossless, RDMA-capable fabrics 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.
• Implement and maintain per-tenant network isolation across compute, storage, and management planes.
• Automate network provisioning, configuration, and validation, treating switch config as code.
• Build telemetry and observability for the fabric, including dashboards and alerting.
• Troubleshoot performance issues end to end, from optics and cabling through switch buffers to NIC/DPU configuration and host behavior.
• Operate the out-of-band management network, console access, and remote recovery paths.
• Support tenant onboarding, including segmentation, addressing, bandwidth guarantees, and capacity planning.
• 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.
• 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.
• 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.
• Practical RDMA fabric experience: lossless Ethernet or InfiniBand, with an understanding of why lossless behavior matters for GPU workloads.
• Network automation as a working practice: scripting, configuration management, config generation from a source of truth, version-controlled changes.
• Solid Linux administration fundamentals.
• Experience with network telemetry and monitoring.
• Experience running corporate/campus networks: wired and wireless, switching, NAC/802.1X, VPN and remote access.
• Clear communicator who enjoys teaching: able to document, pair, and run sessions that bring less network-savvy colleagues up to speed.

Skills

• RoCEv2
• InfiniBand
• QoS
• Congestion control
• Buffer tuning
• BGP
• EVPN/VXLAN
• Ansible
• Python
• NetBox
• CI
• Prometheus
• Grafana
• Datadog
• Streaming telemetry
• Linux networking stack
• PFC
• ECN
• DCQCN
• Cisco Catalyst/Meraki

Location

• Office

Work Type

• Full-time

Experience Level

• 5+ years

Benefits

• Competitive salary
• Equity sign-on bonus
• Biannual bonus scheme
• Fully expensed tech
• Breakfast and dinner allowance for office-based employees

About the Company

• Fuse Energy is a forward-thinking renewable energy startup on a mission to deliver a terawatt of renewable energy - fast.
• We're combining first-principles thinking with cutting-edge technology to build a radically better energy system.
• We raised $210M from top-tier investors including Multicoin, Balderton, Lakestar, Accel, Creandum, Lowercarbon, Ribbit, Box Group and strategic angels like Nico Rosberg, the Co-Founder of Solana and GPs behind Meta, Revolut, Spotify, Uber and more.