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