Lead IT Network Administrator, Network, Voice, AV

KBR Careers; Leatherhead; On-site; GBP 70,000 - 90,000; Full time

Job summary

KBR is seeking a Lead IT Network Administrator to oversee Cisco networking, security, and unified communications across multiple sites in the UK. The role focuses on optimizing, securing, and supporting networked services within regulated environments.

You will lead a team handling complex infrastructure, cloud connectivity, and network reliability, while coordinating with cybersecurity, cloud, and application teams to deliver resilient services in mission-critical settings.

Qualifications

• UK Citizenship required.

Responsibilities

• Configure, administer, and optimize Cisco networking environments (ISE, NDFC, Nexus, VXLAN, EVPN, SD-WAN).
• Manage routing and switching across data centres, offices, cloud, and remote access.
• Administer secure network services, firewalls, and access control policies.
• Manage F5 BIG-IP load balancers and certificates.
• Support Azure networking services and hybrid cloud connectivity.
• Troubleshoot complex infrastructure and connectivity issues across domains.
• Maintain network diagrams, configuration records, and documentation.
• Participate in incident, problem, and change management with cross-team collaboration.

Skills

Cisco networking

Network security

Cloud connectivity

Unified communications

NDFC/Nexus

SD-WAN

Tools

Cisco ISE

NDFC

Nexus switches

Palo Alto firewalls

F5 BIG-IP

Azure networking

Job description

Lead IT Network Administrator, Network, Voice, AV KBR is seeking a Lead IT Network Administrator (Network, Voice & AV) to join our team supporting complex, mission critical IT infrastructure across enterprise and secure environments. This role is responsible for leading the administration, optimisation, and support of networking, voice, and audiovisual services, ensuring high levels of performance, security, and availability across multiple sites. The successful candidate will bring strong expertise in Cisco networking technologies, network security, cloud connectivity, and unified communications, while serving as a key technical escalation point for operational support and infrastructure projects. This is an exciting opportunity for an experienced IT professional to work with advanced networking, security, and collaboration technologies in a highly regulated environment. You will play a key role in maintaining resilient, secure, and high performing services, driving continuous improvement initiatives, and contributing to the delivery of critical business and operational outcomes across the organisation.

This is a permanent, full-time position based in Aldershot, Basingstoke, Salisbury, Southampton, or Swindon. Only candidates with UK Citizenship and holding a BPSS or above should apply. In September 2025, KBR announced that we are spinning our Mission Technology Solutions business into a separate public company. This role will ultimately be part of the new company. The Mission Technology Solutions business partners with governments and defense, intelligence, space, aviation, and critical infrastructure customers to deliver high-end engineering, science, technology, and mission support solutions.

Key Responsibilities

• Configure, administer, and optimize complex Cisco networking environments, including Cisco Identity Services Engine (ISE), Cisco Nexus Dashboard Fabric Controller (NDFC), Nexus switching, Leaf-Spine architectures, VXLAN, EVPN, and SD-WAN technologies (Cisco Viptela and Meraki).
• Manage enterprise routing and switching services across data centres, office locations, cloud platforms, and remote access environments.
• Administer and support secure network services including Palo Alto firewalls, network segmentation, access control policies, and remote connectivity solutions.
• Manage F5 BIG-IP load balancing platforms, including virtual servers, pools, health monitors, certificates, and traffic management policies.
• Support Microsoft Azure networking services, including virtual networks, subnets, network security groups, route tables, gateways, and hybrid cloud connectivity.
• Troubleshoot and resolve complex infrastructure, networking, and application connectivity issues across multiple technology domains.
• Analyse packet captures, traffic flows, monitoring alerts, and platform telemetry to identify root causes and implement corrective actions.
• Perform network upgrades, software patching, hardware refresh activities, lifecycle management, and capacity planning.
• Monitor network availability, performance, and utilization to ensure optimal service delivery and operational stability.
• Support backup, recovery, disaster recovery testing, high availability solutions, and operational resilience initiatives.
• Maintain network diagrams, configuration records, technical standards, and operational documentation.
• Participate in incident, problem, and change management activities to support reliable and secure service delivery.
• Collaborate closely with infrastructure, cybersecurity, cloud, application, and third party support teams to maintain secure and resilient services.

Basic Qualifications

• UK Citizenship is required.
• 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.

Skills & Competencies

• 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.

Preferred 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.

KBR — Delivering Solutions, Changing the World. KBR brings together the best and brightest to deliver science, technology and engineering solutions that help governments and companies around the world accomplish their most critical missions and objectives. In everything we do, we are guided by our ONE KBR Values: We Value Our People – We create diverse, inclusive environments in which each person can feel safe, respected and valued, and where everyone has opportunities to grow and reach their full potential. We Deliver – We are uncompromising in our commitment to deliver innovative, high-quality, technology-led solutions for our customers and exceptional, sustainable value for all our stakeholders. We Are People of Integrity – We value honesty, trust, courage, fairness, prudence and tenacity. We believe doing what’s right for the planet, the communities where we work, and our people is good for business. We Empower – We empower our people with a shared purpose, the right tools and the supportive culture they need to be proactive decision-makers, to be adaptive to change, and to succeed. We Are a Team of Teams – We have a will to succeed, but we value the achievements of our team of teams over individual accomplishments. Our collective focus makes us a better, stronger, more effective company. We have also embedded environmental, social and governance (ESG) principles in every business operation and corporate function. Not only are we committed to operating safely, sustainably and equitably, but we are also committed to using our capabilities and expertise to help our customers accomplish their sustainability goals. Worldwide, KBR employs a diverse workforce approximately 29,000 people strong, with customers in more than 80 countries and operations in 40 countries. At KBR, We Deliver.