Senior Infrastructure and Directory Services Engineer

Senior Infrastructure & Directory Services Engineer - Defence ProgrammeLocation: Caerphilly (with travel to Defence/Ministry of Defence sites as required)Clearance: SC (must hold or be eligible); DV highly desirablePackage: £65,000 + Bonus + comprehensive benefitsWorking Pattern: Hybrid (Mon & Fri optional WFH)This is a fantastic opportunity for you, a Senior infrastructure and Director Services Engineer - or similar, to join a long?established, financially robust technology provider with comprehensive experience delivering secure IT solutions across the UK public sector.The OpportunityA major Defence customer is undertaking an extensive programme to build a secure, on?premise, multi?domain virtualised infrastructure that underpins mission?critical and operational capabilities. As a Senior Infrastructure & Directory Services Engineer, you will design, implement, and support enterprise services across several secure domains - including Active Directory, identity services, Windows Server, DNS/DHCP, PKI, authentication platforms, and related Microsoft ecosystem components.Key Responsibilities- Architect, manage, and maintain multi?site Active Directory environments- Administer DNS, DHCP, and PKI in secure operational environments- Design and enforce Group Policy Objects (GPOs)- Manage Web Application Proxy (WAP), RDS, and federation services- Ensure alignment with MOD security standards- Participate in design reviews and Change Advisory Boards (CAB)- Work closely with security, cloud, networking, Linux, and virtualisation teams- Monitor performance using Splunk, event logging, and PowerShell automation- Automate tasks using PowerShell (essential) or Ansible (desirable)Essential Skills & Experience- Multi?site Active Directory support- Windows Server, DNS, DHCP- GPO design and troubleshooting- PKI and certificate services- Web Application Proxy & RDS- Strong PowerShell scripting- Working in a Defence or Government environmentDesirable Skills- Defence sector experience- VMware vSphere, vCenter, ESXi; awareness of NSX?T- SIEM/monitoring experience- Ansible or other automation tools- Linux/Unix integration with AD- Secure WAN technologies (BGP/MPLS/VPN)- Existing SC/DV clearanceQualifications- Microsoft Identity & Access Administrator (or equivalent)- ITIL v4 Foundation or higher- Degree in Computer Science or equivalent experiencePersonal Attributes- Customer?focused and committed to service excellence- Strong ownership and reliability- Willingness to challenge established practices- Driven, proactive, and collaborativeIf you are a Senior Infrastructure and Director Services Engineer or similar, with a background in Defence, then please send your CV to me today as this will go quickly.