Network Engineer

Network Engineer (Cisco ISE & Wireless) Contract | Hybrid | Defence Sector

Our client, a leading UK defence technology organisation, is seeking an experienced Network Engineer to support the design, implementation and optimisation of secure enterprise network infrastructure.

This is a hands‑on engineering role focused on Cisco Identity Services Engine (ISE),
Cisco Catalyst 9800 Wireless LAN Controllers
, secure network access and enterprise wireless technologies. You'll work on critical infrastructure projects, helping to modernise and secure highly available network environments.

• Deploy and optimise Cisco ISE and Catalyst 9800 wireless solutions.
• Lead wireless infrastructure upgrades and migration from legacy platforms.
• Implement and support 802.1X, MAB, RADIUS, EAP‑TLS/PEAP authentication and policy enforcement.
• Troubleshoot complex authentication, connectivity and wireless performance issues.
• Support high‑availability deployments, upgrades, patching and lifecycle management.
• Produce technical documentation and work closely with internal stakeholders and Cisco TAC.

• Strong enterprise networking background covering TCP/IP, VLANs, OSPF/BGP, DHCP, DNS and network security
  .
• Hands‑on experience with Cisco ISE including policy sets, profiling, guest/BYOD, HA deployments and upgrades.
• Expertise with Cisco Catalyst 9800 Wireless LAN Controllers
  , CAPWAP, WLAN configuration, RF optimisation and enterprise wireless deployments.
• Experience integrating ISE and Wireless environments, including dynamic VLAN assignment, role‑based access and end‑to‑end authentication troubleshooting.
• Strong troubleshooting skills with tools such as Wireshark and experience working within structured change management environments.

This is an excellent opportunity to join a market leading defence organisation delivering secure, business critical infrastructure projects within a collaborative engineering environment. Candidates must be eligible to undergo UK security clearance.