Salary: £18,000 - 21,000 per year Requirements: Active SC Clearance (mandatory) Strong hands-on experience with Cisco ACI in large enterprise environments Proven experience delivering ACI upgrades and platform refreshes Deep knowledge of APIC and ACI policy model Experience with multi-site ACI environments Strong Nexus / NX-OS experience Strong understanding of EVPN/VXLAN and underlay/overlay architectures Experience working in highly regulated, business-critical environments Excellent troubleshooting skills in complex fabric environments Responsibilities: Delivering Cisco ACI fabric upgrades across multiple enterprise environments Supporting the modernisation of ACI orchestration and management platforms Leading APIC platform refresh and ACI platform upgrades Working on Nexus fabric and ACI control-plane modernisation Designing and maintaining ACI policy models (tenants, VRFs, BDs, EPGs, contracts, L4-L7) Contributing to underlay/overlay fabric design (EVPN/VXLAN, IS-IS/BGP) Producing design documents, upgrade plans, and implementation runbooks Leading and supporting high-risk, out-of-hours change and upgrade activities Troubleshooting complex ACI fabric, APIC, and policy-related issues Working closely with security, compute, storage, and cloud teams Technologies: Cloud Cisco Fabric Network Nexus Security More: We are looking for an SC Cleared Senior Cisco ACI Network Specialist to join our major enterprise datacentre transformation programme within a highly regulated environment. This is a hands-on, ACI-first role focused on upgrading, modernising, and standardising large-scale Cisco ACI and Nexus fabric environments. Youll be working across multiple enterprise datacentre fabrics, delivering upgrades, platform refreshes, and fabric modernisation as part of a long-term, Cisco-led strategy. This is a contract role based in London with a hybrid work arrangement of 1-2 days onsite. last updated 6 week of 2026