Senior IT Systems Engineer – Corsham (SN13) – Permanent – Full Time

Salary: £45,000 - £65,000

* 25 days annual leave (inclusive of up to 3 days December shut-down)

* Buy or sell up to 5 annual leave days

* Two pension schemes to choose from

* Private Medical & Dental Insurance + discounts for additional family members

* Life Assurance scheme up to 4 x salary

* Multiple Save schemes

* Electric/Hybrid Car leasing scheme

* Cycle to work scheme

* Retail discounts

* Continuous Professional Development support

* Annual Wellness Allowance

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.

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:

Essential experience

* 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

Who is MASS?

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.

Apply today to see how working for MASS could work for you

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