Senior Infrastructure And Directory Services Engineer

Senior Infrastructure & Directory Services Engineer - Defence Programme

Location:

Caerphilly (with travel to Defence/Ministry of Defence sites as required)

Clearance: SC (must hold or be eligible); DV highly desirable

Package: £65,000 + Bonus + comprehensive benefits

Working Pattern:
Hybrid (Mon & Fri optional WFH)

A 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.

• 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 Power Shell automation
• Automate tasks using Power Shell (essential) or Ansible (desirable)

• Multi‑site Active Directory support
• Windows Server, DNS, DHCP
• GPO design and troubleshooting
• PKI and certificate services
• Web Application Proxy & RDS
• Strong Power Shell scripting
• Working in a Defence or Government environment

• 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 clearance

• Microsoft Identity & Access Administrator (or equivalent)
• ITIL v4 Foundation or higher
• Degree in Computer Science or equivalent experience

• Customer‑focused and committed to service excellence
• Strong ownership and reliability
• Willingness to challenge established practices
• Driven, proactive, and collaborative

If 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.