IT System Administrator

Sanderson Government & Defence; England; On-site; GBP 50,000 - 80,000; Full time

Job summary

A leading global technology organization is seeking a Senior IT Systems Administrator based in Gloucestershire, UK. In this hybrid role, you will provide technical support, monitor system performance, and develop documentation while working on critical national security projects. The ideal candidate has a strong background in Windows Server and must be a sole British citizen eligible for national security clearance.

Benefits

Competitive salary

Comprehensive benefits package

Career growth opportunities

Inclusive work culture

Qualifications

• Must have a strong background in Windows Server Administration.
• Candidates should be eligible for national security clearance.
• Sole British citizens with no criminal record required.

Responsibilities

• Provide 1st and 2nd line technical support across complex IT environments.
• Monitor system performance to ensure uptime and efficiency.
• Develop and maintain system documentation.

Skills

Windows Server Administration (2016/2019)

ITIL best practices

Organizational skills

Analytical mindset

Communication and collaboration skills

Tools

AWS

Azure

Active Directory

VMware

PowerShell

Job description

Senior IT Systems Administrator

Location: Gloucestershire, UK (Hybrid working)

Employment Type: Full-time, Mid-Senior level

About the Opportunity

Sanderson is collaborating with a leading global technology organisation that delivers mission-critical services in secure environments for government and national security clients. The team is expanding and seeking a skilled Senior IT Systems Administrator to join a high-performance environment supporting critical infrastructure operations.

In this role, you’ll work across multiple teams to ensure stability, performance, and compliance across enterprise systems — maintaining secure IT environments and helping drive continual service improvement through innovation and best practice.

Key Responsibilities

• Provide 1st and 2nd line technical support across complex IT environments
• Monitor system performance to ensure uptime, reliability, and efficiency
• Develop, maintain, and update system documentation
• Implement and enforce operational standards, policies, and procedures
• Support compliance initiatives and internal process improvements

Essential Skills & Experience

• Strong background in Windows Server Administration (2016/2019)
• Experience working to ITIL best practices
• Excellent organisational and time management skills
• Analytical mindset with a proactive approach to identifying risks and improvements
• Strong communication and collaboration skills, with a willingness to share and learn

Desirable Technologies & Experience

• Installation, upgrade, configuration, and support experience with Windows Server, AWS, and Azure
• Strong understanding of Active Directory (object creation, OU management, RBAC, DFS)
• Knowledge of virtualisation technologies: VMware, vSphere, vSAN, SCVMM, Hyper‑V
• Familiarity with containerisation tools and technologies
• Networking fundamentals: TCP/IP, DHCP, DNS, LAN/WAN
• Scripting experience in PowerShell
• Awareness of McAfee EPO/ENS security tools

Security Clearance Requirements

Due to the nature of the work, candidates must be eligible for national security clearance. To meet this requirement, applicants must:

• Be sole British citizens (dual nationality is not permitted)
• Have not spent more than 30 consecutive days outside the UK in the past 10 years
• Have no criminal record
• Have no significant financial irregularities (e.g. bankruptcy, unpaid debt)

Unfortunately, candidates who do not meet these criteria cannot be considered for this position.

Why You’ll Enjoy Working Here

• Competitive salary and comprehensive benefits package
• Hybrid working model balancing flexibility and collaboration
• Career growth opportunities through continuous learning and development
• Work on high-impact, nationally significant projects
• Inclusive, people-first culture focused on wellbeing and professional excellence