Lead IT Network Administrator, Network, Voice, AV
On-siteLeatherhead, England, United Kingdom
Job Summary
Configure, administer, and optimize complex Cisco networking environments, including Nexus switching, SD-WAN, and Cisco ISE. Manage enterprise routing and switching services across data centers, cloud platforms, and remote access, while administering secure network services such as Palo Alto firewalls and F5 BIG-IP load balancers. Troubleshoot connectivity issues by analyzing packet captures and telemetry, and perform network upgrades, capacity planning, and disaster recovery testing. Monitor availability and utilization to ensure operational stability, maintaining documentation and participating in incident and change management activities. Collaborate with infrastructure and cybersecurity teams to support resilient services in a highly regulated environment. This permanent role is based in Aldershot, Basingstoke, Salisbury, Southampton, or Swindon.
Required Qualifications
- UK Citizenship
- Current Baseline Personnel Security Standard (BPSS) clearance or higher
- Strong hands on experience with Cisco networking technologies, including Nexus switching, Cisco ISE, SD-WAN, and modern data centre networking solutions
- Experience supporting Cisco Nexus environments, including Leaf-Spine architectures, VXLAN, and EVPN technologies
- Experience administering Cisco NDFC or equivalent data centre network management platforms
- Experience supporting enterprise routing and switching technologies across large scale environments
- Experience administering Palo Alto firewalls and enterprise network security solutions
- Experience supporting F5 BIG-IP load balancers and Microsoft Azure networking services
- Experience with network monitoring, traffic analysis, and packet capture tools
- Proven ability to diagnose and resolve complex issues across network, cloud, and security platforms
- Experience supporting resilience, business continuity, and disaster recovery initiatives
- Advanced knowledge of enterprise networking technologies, including BGP, OSPF, VLANs, VRFs, Spanning Tree Protocol, and link aggregation
- Strong understanding of modern data centre networking concepts, including Leaf-Spine architectures, VXLAN, and EVPN
- Knowledge of VPN technologies, network access control, authentication, authorization, and network security principles
- Ability to analyse network performance, identify root causes, and implement effective remediation strategies
- Strong understanding of operational best practices, including monitoring, patching, lifecycle management, documentation, and change control
- Excellent troubleshooting and analytical skills within complex enterprise environments
- Strong communication, documentation, and stakeholder engagement capabilities
- Ability to work effectively within highly regulated and security conscious environments
Desired Qualifications
- Cisco certifications such as CCNP Enterprise, CCNP Data Center, or equivalent
- Palo Alto Networks certifications or significant operational experience
- F5 certification or extensive hands on BIG-IP LTM administration experience
- Microsoft Azure networking certification or equivalent cloud networking expertise
- Experience supporting Defence, Government, Aerospace, or other highly regulated environments
- Experience with Cisco TrustSec, Security Group Tags (SGT), or identity based network segmentation
- Experience with Azure ExpressRoute, cloud interconnects, and colocation facilities
- Experience with automation and scripting technologies such as Python, Ansible, or Terraform
- Experience supporting global enterprise networks across multiple locations and telecommunications providers
- Exposure to Secure Access Service Edge (SASE), advanced network security technologies, or application delivery solutions
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