System AdministratorUp to £55,000 | Permanent | Farnborough (hybrid flexibility)National Security and Defence | Security Clearances required prior to startAre you a system admin with Windows and Linux experience and want to keep critical systems reliable, secure, and up to date across multiple environments. Here, you''ll own monitoring, patching, and hardening workflows that underpin a high-profile programme.This is working for a growing defence consultancy with extensive growth secured for the next few years, with lots of projects in the Defence Industry.Core FocusProactively monitor and triage alerts (ElasticMaintain resilient network connectivity across the estateRun vulnerability assessments (Nessus) and action SOC outputsImplement Firewall upgrades and configuration changesManage WSUS for controlled Windows patch deploymentsMaintain Linux repositories and oversee patching cycles (pre-prod - prod)EssentialsProven System Administration in secure/enterprise environmentsHands-on with Linux and Windows ServerPatching at scale (WSUS, Linux repos) and Firewall managementUnderstanding of network protocols and core cyber security principlesFamiliar with Elastic monitoring, Nessus, and SOC workflowsIf you take pride in clean operational execution and secure-by-default systems, this is a solid fit.There are good corporate benefits and lots of career growth and opportunities going forward.Successful applicants will be required to be security cleared prior to appointment.