ACI Network Engineer (SC Cleared)

Senior Cisco ACI Network Specialist (SC Cleared)

• Location: London (Hybrid - 1-2 days onsite)
• Contract: 6 months
• Rate: 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 Doing

• 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

What We're Looking For

• 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
  • ACI policy model
  • 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