Job Title: Network Engineer (Some Infrastructure) Location: Corsham (30% on-site, 60% remote, 10% other sites including Portsmouth) Contract Type: Permanent Salary: £425-450 a day Outside IR35 (Talk to me if this is close but not quite enough) Security Clearance: SC required, DV preferred ( or willingness to undergo DV clearance ) The Opportunity: Are you ready to take on a challenging and rewarding role in a high-security environment? This is your chance to work on cutting-edge private cloud platforms, supporting critical UK defence operations. You'll be at the heart of a dynamic, fast-moving team, responsible for designing and maintaining secure, scalable networks that underpin essential military and government services. The Role: As a Network Infrastructure Engineer, you will: Design, deploy, and manage software-defined and physical networks in a secure private cloud. Support multi-tenant environments, ensuring seamless onboarding and transition of tenants with diverse network and application needs. Implement and maintain Cisco ACI/APIC and Fortigate Next-Generation Firewalls (NGFW) at both the edge and core. Manage VMware NSX-T to ensure integration with Cisco ACI networking. Ensure security best practices, vulnerability scanning (Nessus), and system hardening (CIS benchmarks). Provide third-line technical support and respond to live operational incidents. Create and maintain detailed system design and configuration documentation. The Person: You should have experience in secure network infrastructure within defence, MOD, or government environments. Essential skills include: Cisco ACI/APIC spine and leaf network architecture (or relevant Cisco certification). Fortigate NGFW and FortiSwitch management. VMware NSX-T virtualised networking. Experience in air-gapped/non-internet connected environments. Strong troubleshooting and third-line support capabilities. Desirable Skills: VMware Cloud Foundation (vSphere 7), VMware Aria Operations (SIEM integration). Linux (Ubuntu preferred) and Windows OS administration. Automation/scripting (GitLab CI/CD, Python, Shell, PowerShell). Security Clearance: SC clearance required DV clearance preferred (or willingness and eligibility to undergo the process) This role requires 30% on-site work in Corsham, 60% remote, and 10% travel to sites including Portsmouth.