Senior Infrastructure Engineer (Windows & VDI

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Senior Infrastructure Engineer (Windows & VDI)
Corsham (Onsite – 5 days per week)£65,000 – £75,000 + Excellent Benefits

Windows Server | Active Directory | Citrix | VMware Horizon | SQL Server | Group Policy | Defence | ITIL

Help deliver the infrastructure behind the UK’s critical defence operations.

Are you an experienced Infrastructure Engineer with expertise in Windows Server and Virtual Desktop Infrastructure?

We’re looking for a Senior Infrastructure Engineer (Windows & VDI) to join a nationally significant UK Defence programme, supporting the Windows infrastructure and virtual desktop environments that enable critical operational capabilities across the UK and overseas.

If you enjoy solving complex infrastructure challenges, working with enterprise-scale Microsoft technologies and supporting systems where resilience and security are paramount, this is an opportunity to make a genuine impact while developing your career in one of the UK’s most advanced secure IT environments.

Thorn SDS is a specialist Managed Service Provider headquartered in Alton, Hampshire. We partner with organisations across the Space, Defence and Security sectors, connecting exceptional technical professionals with some of the UK’s most challenging and rewarding programmes.

You’ll be joining a major transformation programme modernising the Ministry of Defence’s deployable IT capability.

The programme is replacing legacy communication and information systems with modern, resilient and secure platforms.

As part of the Through Life Support (TLS) team, you’ll help ensure these critical services remain secure, available and fully operational throughout their lifecycle.

As a Senior Infrastructure Engineer (Windows & VDI), you’ll provide advanced 2nd and 3rd line support across enterprise Windows infrastructure and Virtual Desktop environments that underpin mission‑critical defence systems.

Working within the Service Operations and Resolver Group teams, you’ll investigate complex incidents, maintain critical Microsoft platforms and collaborate with infrastructure, networking and application specialists to ensure services remain resilient, secure and highly available.

Please note:

This role focuses exclusively on Microsoft Windows infrastructure and VDI technologies. Linux administration is not part of this position.

• Supporting, maintaining and troubleshooting enterprise Windows Server environments (2016, 2019 and 2022).
• Administering Active Directory, Group Policy, DNS, DHCP and core Microsoft infrastructure services.
• Providing advanced 2nd and 3rd line support across Windows infrastructure and VDI platforms.
• Supporting and maintaining Citrix Virtual Apps & Desktops and/or VMware Horizon environments.
• Deploying operating system updates, security patches and infrastructure improvements.
• Monitoring infrastructure health, performance and capacity to ensure maximum availability.
• Investigating complex technical issues and carrying out root cause analysis.
• Supporting ITIL‑aligned incident, problem and change management processes.
• Working collaboratively with networking, application and service teams to improve platform resilience and performance.
• Producing and maintaining technical documentation, knowledge articles and operational procedures.

You’ll be an experienced Infrastructure Engineer who enjoys working in secure, enterprise‑scale environments and solving complex technical challenges.

You’ll ideally have experience with:

• Windows Server 2016, 2019 and 2022 administration.
• Active Directory, Group Policy, DNS and DHCP.
• Citrix Virtual Apps & Desktops and/or VMware Horizon.
• Enterprise Windows infrastructure support.
• ITIL service management processes.
• Network fundamentals and Windows application support.
• Performance tuning, patch management and…