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)

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 Opportunity
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.

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 environment

Desirable 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 clearance

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

Personal Attributes
- 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.