Senior Network Engineer

We are seeking an experienced Senior Cisco Network Consultant to support a major security transformation programme for a leading UK engineering and defence organisation.

The successful candidate will play a key role in delivering a single, enterprise-wide Network Access Control solution across multiple UK locations, replacing existing NAC platforms and standardising access control policies across the business. This is a hands‑on technical delivery role requiring deep expertise in Cisco Identity Services Engine (ISE), network security, authentication services, and large‑scale enterprise infrastructure environments.

• Lead the deployment, configuration and implementation of Cisco ISE solutions across multiple sites.
• Implement and migrate Network Access Control (NAC) services from existing platforms into Cisco ISE.
• Deliver the approved Low‑Level Design (LLD) and support technical implementation activities.
• Configure and manage authentication services including 802.1X (wired and wireless), MAC Authentication Bypass (MAB), Guest Access and Captive Portal services.
• Integrate Cisco ISE with Cisco Switching and Wireless Infrastructure, Active Directory, Microsoft Entra , Microsoft NPS and Firewalls/security services.
• Design and implement policy sets, profiling, posture assessment, and access control workflows.
• Perform testing and validation activities including Functional Testing, Failover Testing and User Acceptance Support.
• Troubleshoot complex authentication and network access issues during deployment and early life support phases.
• Work closely with network, security, and infrastructure teams to ensure successful delivery.
• Produce technical documentation, implementation guides, and operational procedures.
• Deliver knowledge transfer sessions and workshops to internal IT teams.

• Strong hands‑on experience delivering multiple Cisco ISE implementations within enterprise environments.
• Proven experience migrating devices and services from existing NAC solutions.
• Deep understanding of Cisco ISE 3.x or later, 802.1X Authentication, MAB/RADIUS and TACACS+, Guest Access Services, High Availability and Multi‑Site Deployments.
• Experience integrating Cisco ISE with Active Directory, Entra , Microsoft NPS and Cisco Network Infrastructure.
• Strong troubleshooting and diagnostic skills across network access and authentication technologies.
• Cisco Certified Network Professional (CCNP) certification.
• CCNA with significant Cisco ISE implementation experience.
• Cisco Fire Jumper Field Engineer Certification.

Senior Cisco Network Consultant – Luton HQ (1–2 days a week with some travel to other UK sites). BPSS Eligible. Up to £65 p/h inside IR35.