Role OverviewWe are seeking a DV-cleared Infrastructure Engineer to support the design, build, integration, and maintenance of secure on-premise IT infrastructure within a Defence and National Security environment.This is a hands-on contract role, working within highly secure systems and to hardened build standards, supporting mission-critical platforms and services.Key ResponsibilitiesDesign, build, integrate, test, and maintain secure on-premise IT infrastructure solutions.Specify, deploy, and support Windows Server and Desktop environments, including repeatable operating system builds using Microsoft Deployment Toolkit (MDT) or equivalent tools.Implement hardware platforms and operating systems in line with hardened security build standards.Deliver Windows Server OS and Active Directory domain upgrades and migrations.Define, deploy, manage, and troubleshoot Microsoft Active Directory Group Policy.Implement, configure, and upgrade SAN storage solutions, including version migrations.Deploy and manage VMware virtualisation infrastructure.Integrate infrastructure with enterprise services such as:Monitoring and alerting toolsPatch and update management platformsAnti-virus and endpoint security solutionsConduct vulnerability and compliance activities using recognised scanning tools.Design, build, and deploy Public Key Infrastructure (PKI) solutions.Produce and maintain High-Level Design (HLD) and Low-Level Design (LLD) documentation and detailed build guides.Essential Skills and