UK CITIZENSHIP REQUIRED FOR THIS POSITIONLocation: South West London Salary: 45k - 55kClearance: SC (or eligible)IT Infrastructure Administrator to work across IT and Operational Technology (OT) teams at a defence company based in London. Infrastructure Systems Administrator will design, develop, and maintain secure infrastructure for defence platform management systems for military vehicles. Responsibilities:Designing ICS Infrastructure for Integrated Platform Management Systems, ensuring defence-grade security.Integrating IT/OT systems to support mission-critical operations.Managing Windows Server and Red Hat Linux environments. Implementing virtualisation solutions; either VMware or Hyper-V. Enforcing cybersecurity standards. Requirements:Proven experience in IT infrastructure, IT and OT integration preferred.Strong skills in Windows Server domains and some Linux.Hands-on experience with virtualisation technologies like VMware and Hyper-V.Knowledge of cybersecurity standards. Must be eligible for Security Clearance and be a UK Citizen.