Senior Infrastructure Engineer

Senior IT Infrastructure Engineer - Onsite, SN13

£45,000 - £65,000

• 25 Days annual leave
• Buy or sell up to 5 days' annual leave
• Annual wellbeing allowance
• Two pension schemes to choose from
• Private medical insurance + Discounts for additional family members
• Private Dental
• Life assurance scheme up to 4x salary
• Share save scheme
• Electric/Hybrid car leasing scheme
• Cycle to work scheme
• Retail discounts

We’re looking for a dependable and hands-on Senior IT Infrastructure Engineer to help maintain and enhance our secure on-premise environment. From complex third-line issue resolution to the delivery of infrastructure improvements, this is a varied and rewarding role with a strong focus on storage, backup, and virtualisation technologies. If you’re methodical in your work, calm under pressure, and take pride in running reliable systems, this could be your next move.

This is a position for a seasoned infrastructure engineer who’s confident managing enterprise-grade systems in a secure or air-gapped environment. You’ll take ownership of critical infrastructure components, support major upgrades, and play an active role in ensuring performance, availability, and data integrity across our physical and virtual platforms.

Your day will involve maintaining storage arrays, administering backup & replication, managing Windows Server and VMware environments, and contributing to the continuous improvement of our infrastructure. You’ll work closely with colleagues across the IT function, supporting service delivery and project activity in a collaborative, high-trust setting.

How you’ll support us

You’ll provide dependable third-line support, diagnosing and resolving issues across servers, storage, and backup systems. Day to day, you’ll maintain and enhance Microsoft Windows Server, Active Directory, and VMware environments, while managing HP storage and Veeam backup platforms to safeguard data and maintain business continuity. You’ll take ownership of maintenance schedules, patching, and change activity, ensuring that our infrastructure remains secure, resilient, and well-documented. You’ll also contribute to service stability and continuous improvement by identifying root causes, implementing permanent fixes, and helping to optimise performance and reliability.

Essential experience

• Proven experience in server infrastructure administration and third-line support
• Strong knowledge of Microsoft Windows Server (including Active Directory and Group Policy)
• Practical experience with VMware technologies (vSphere, ESXi, vCenter)
• Hands-on expertise with HP storage platforms (e.g. 3PAR, Primera, Alletra)
• Solid working knowledge of Veeam Backup & Replication for backup and disaster recovery
• Understanding of change, incident, and problem management processes

Desirable experience

• Experience with Windows Server roles such as DFS, and DNS
• Familiarity with performance monitoring and capacity planning for storage and backup systems
• Experience developing automation or scripting for routine maintenance tasks
• ITIL Foundation or equivalent service management certification
• Due to the highly-secure nature of the projects you will be involved with, you must be eligible to work in the UK and be eligible to undergo and maintain UK government 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!