Senior Cisco ACI Network Specialist (SC Cleared)Location: London (Hybrid - 1-2 days onsite)Contract: 6 monthsRate: 700 Inside IR35 We''re looking for an SC Cleared Senior Cisco ACI Network Specialist to join a 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. You''ll be working across multiple enterprise datacentre fabrics, delivering upgrades, platform refreshes, and fabric modernisation as part of a long-term, Cisco-led strategy. What You''ll Be DoingDelivering Cisco ACI fabric upgrades across multiple enterprise environmentsSupporting the modernisation of ACI orchestration and management platformsLeading APIC platform refresh and ACI platform upgradesWorking on Nexus fabric and ACI control-plane modernisationDesigning 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 runbooksLeading and supporting high-risk, out-of-hours change and upgrade activitiesTroubleshooting complex ACI fabric, APIC, and policy-related issuesWorking closely with security, compute, storage, and cloud teams What We''re Looking ForActive SC Clearance (mandatory)Strong hands-on experience with Cisco ACI in large enterprise environmentsProven experience delivering ACI