Senior IT Systems Engineer

Mass Limited; Corsham; On-site; GBP 65,000 - 90,000; Full time

Job summary

The MASS facility in the UK requires a seasoned Senior IT Systems Engineer to own third-line incidents and drive continuous improvements across air-gapped on-premise environments.

You'll administer Windows Server environments, Active Directory, and VMware-based infrastructure, with strong focus on backup/recovery using Veeam and change management. Collaboration with delivery teams and a security-first mindset are essential.

Qualifications

• Experience in server infrastructure support and administration.
• Strong VMware knowledge (vSphere/ESXi/vCenter).
• Hands-on Windows Server, Active Directory, and Group Policy administration.
• Experience with backup/recovery and change management.
• Familiarity with ITIL principles and service management.
• Basic Linux knowledge.

Responsibilities

• Provide third-line support for secure on-premises infrastructure.
• Maintain and administer Windows Server environments and Active Directory.
• Manage VMware-based virtual infrastructure.
• Oversee backup and recovery processes with Veeam.
• Contribute to change control, system improvements and documentation.

Skills

VMware technologies

Windows Server administration

Active Directory

Group Policy

ITIL

Linux basics

Server infrastructure

Tools

VMware vSphere/ESXi/vCenter

Veeam Backup & Replication

HP OneView/Synergy

SharePoint 2016

Job description

This is a role for a seasoned infrastructure engineer who's confident supporting on-premise systems in a highly secure, air-gapped environment. You'll take ownership of third-line incidents, contribute to technical upgrades, and play an active role in maintaining availability and performance across our virtual and physical environments. Your day will include supporting and improving VMware infrastructure, administering Windows Server environments, and helping ensure continuity through effective backup, recovery, and change management practices. You'll work on site at our unique facility to support and improve air-gapped infrastructure. This is a collaborative, hands-on role, working closely with internal delivery teams in a high-trust environment.

How you'll support us

You'll provide reliable third-line support, resolving incidents and troubleshooting issues across our secure infrastructure. Day to day, you'll maintain and administer Microsoft Windows Server environments, including Active Directory, while supporting and enhancing our VMware-based virtual infrastructure. You'll also manage backup and recovery processes using Veeam, ensuring data resilience and business continuity. Part of your role will include keeping technical documentation up to date, and contributing to service stability through proactive maintenance, system improvements, and adherence to change control processes.

The invaluable experience you'll bring, to help us achieve more

We're expecting that you've done this role before, so you'll know how to do it whilst spinning multiple plates

We're looking for a dependable, hands-on Senior IT Systems Engineer to help keep our secure environments running efficiently. From third-line issue resolution to contributing to infrastructure improvements and projects, this is a varied role with a strong focus on virtualisation and Windows Server technologies. If you're calm under pressure, methodical in your work, and keen to have a meaningful impact in a high-assurance setting, this could be your next move.

• Proven experience in server infrastructure support and administration
• Solid knowledge of VMware technologies (vSphere, ESXi, vCenter)
• Hands-on experience with Microsoft Windows Server, Active Directory, Group Policy

Desirable experience

• Exposure to HP infrastructure (e.g. Synergy, OneView, SAN)
• SharePoint 2016 support and administration
• Familiarity with Windows Server roles such as DFS, DHCP, DNS, Clustering
• Experience with Veeam backup and replication tools
• Understanding of ITIL principles and service management
• Basic Linux knowledge

Our non-negotiables Due to the highly secure nature of the projects that you will be involved with, you must be:

• A UK National and eligible to work in the UK
• Eligible to obtain and maintain a UK Government Developed Vetting (DV) clearance

MASS is an independent, global technology company, trusted by highly secure organisations to provide advanced, digital services that manage data and keep information safe. With our heritage in defence, we offer robust solutions to sectors where security expertise is essential.

We work in partnership with customers, using skilled, technical experts. We think innovatively to provide tailored, agile and resilient solutions that secure advantage, so you're ready for digital transformation.

MASS is an equal opportunities employer; we know that our people are smart, skilled and motivated and in return we provide a friendly workplace where everyone is valued and has the chance to make an impact.