Senior Network Engineer

Salary: £55,000 - 95,000 per year

Requirements

• Strong routing and switching knowledge, including OSPF, BGP, EIGRP, summarisation, redistribution, route maps and path selection.
• Experience configuring VLAN trunking, EtherChannel and Layer 2 redundancy.
• Experience with enterprise LAN, WAN and data centre architecture.
• Knowledge of data centre technologies including Cisco Nexus, Catalyst, vPC, VXLAN/EVPN, ACI and fabric architectures.
• Experience in network migration and transformation projects.
• Ability to analyse, review and understand network topologies.
• Experience designing rack layouts and structured cabling for medium data centres.
• Ability to coordinate multiple projects, change management and governance, working independently and as part of a team.
• Strong TCP/IP, subnetting, VLAN, VRF, ACL, NAT, DNS and DHCP knowledge.
• Advanced troubleshooting skills using packet captures, logs, flow data and monitoring tools.
• Experience with resilient network design including HSRP/VRRP, port-channeling and redundant uplinks.
• Firewall, security zoning, rulebase and traffic-flow validation experience.
• Experience producing LLDs, implementation plans, test plans, handovers, as-built documentation and network diagrams.
• Good customer-facing skills with the ability to keep customers informed and understand their requirements.
• Desirable: automation or scripting experience in Python.
• Desirable: exposure to Ansible, Terraform, YAML, NetBox, Git or CI/CD pipelines.

Responsibilities

• We plan, manage and deploy technology changes to support data centre services.
• We deploy LAN infrastructure to support end-user service requirements.
• We manage patching schedules for facilities to cable network equipment.
• We create diagrams for Network Operations.
• We manage inventory.
• We create detailed implementation plans for RFCs.
• We document pre-checks and post-checks for change verification.
• We document back-out plans, including back-out points and points of no return.
• We plan changes to support the stability and uptime of essential services.
• We identify opportunities to complete changes with zero downtime to hosted services.
• We plan and implement changes using a cost-effective resource strategy.
• We identify, understand and document change risks and mitigation tactics.
• We document the impact of planned technology changes and expected verification outputs.
• We document the network estate to support operations and change planning.
• We peer review and validate technical deployment plans.
• We provide constructive feedback to peers to maintain high standards of detail and quality.

Technologies

• Ansible
• Business Intelligence
• CI/CD
• Cloud
• Cisco
• Fabric
• Firewall
• Flow
• Git
• Support
• LAN
• Marketing
• NAT
• Network
• Nexus
• Python
• Security
• TCP/IP
• Terraform
• LESS

More

We are CACI, a London-based organisation founded in 1975, with operations across the UK, Europe and India and more than 1,600 full-time employees. We help organisations make strategic, data-driven decisions through solutions spanning business intelligence, customer marketing, cloud infrastructure, cybersecurity, critical national infrastructure and data management. Our Network Services team is a rapidly expanding specialist IT and networks consultancy, working with major clients across Global Media, Banking, Government, Telecoms and Utilities. This Level 2 Network Engineer role sits within our UK Deployment Team, supporting the planning, delivery and deployment of customer network infrastructure and network and security projects. We offer a hybrid working approach and foster an inclusive culture where our people can be authentic and succeed in their careers.

last updated 36 week of 2026