Job Title: Infrastructure Engineer (DV Cleared) Location: Farnborough or Twickenham (Onsite) Rate: 600-650 a day (Inside IR35) Contract: Minimum 6 months IR35: Inside IR35 Clearance: Active DV clearance required The Opportunity We're supporting a search for a DV Cleared Infrastructure Engineer to join a programme delivering critical infrastructure services within a secure Defence environment. You'll be part of a team responsible for implementing and managing infrastructure and network changes across a complex estate. The environment combines Microsoft and Cisco technologies with secure, mission-critical systems where reliability and performance are essential. This is a hands-on role suited to someone who enjoys solving technical challenges, owning change activities, and working closely with operational teams in a high-security environment. The Role You'll be responsible for delivering infrastructure changes, maintaining stability across the estate, and supporting the wider service delivery team. Key responsibilities include: Leading and implementing infrastructure and network change activities. Administering Windows Server environments including AD, DNS, DHCP and Group Policy. Supporting Linux environments (Ubuntu / CentOS). Working with networking technologies including TCP/IP, load balancing and firewalls. Supporting Microsoft stack technologies such as SharePoint, SQL Server, Exchange and Teams. Maintaining and troubleshooting storage technologies including SAN, iSCSI, SMB and NetApp. Diagnosing and resolving complex incidents while maintaining service availability. Supporting Service Desk and second-line teams when escalation is required. Producing and maintaining high-quality technical documentation. Identifying opportunities for improvement and introducing relevant technologies. Occasional travel to other secure sites may be required. The Person You'll be a technically capable infrastructure engineer who is comfortable working in secure, operational environments and taking ownership of complex issues. Essential experience required : Strong Windows Server administration experience (2008–2025). Deep knowledge of Active Directory, DNS, DHCP and Group Policy. Experience installing and configuring Windows Server and Windows 10/11 environments. Good Linux administration skills (Ubuntu / CentOS). Knowledge of networking technologies including TCP/IP and firewall concepts. Desirable: ITIL Foundation certification. Experience working within ITIL service management frameworks. What's on Offer Minimum 6-month contract with potential for extension.