Systems Administrator

Lever; City of Westminster; On-site; GBP 42,000 - 65,000; Full time

Job summary

Shield AI in the United Kingdom seeks a Systems Administrator to support, secure, and optimize enterprise IT operations across Windows and Linux environments.

You will manage Active Directory and Azure AD, administer asset lifecycle, and mentor junior staff while collaborating with infrastructure, network, and security teams to address incidents and maintain security standards.

Qualifications

• 3+ years of experience in systems administration or enterprise desktop support roles.
• 5+ years of IT experience, with at least 2 years in a senior or mentoring capacity.

Responsibilities

• Provide hands-on desktop, server, and systems administration support for Windows and Linux environments.
• Install, configure, and troubleshoot hardware and software issues across end-user devices and server systems.
• Administer user accounts, access control, and group policies using Active Directory and Azure AD.
• Manage IT assets throughout their lifecycle: procurement, deployment, support, and decommissioning.
• Ensure proper inventory control, software licensing compliance, and asset tracking using IT asset management tools.
• Generate reports on hardware/software usage, compliance, and asset depreciation for internal and audit needs.
• Lead and mentor junior administrators and support staff; contribute to technical documentation and team training.
• Participate in on-call rotation and perform maintenance activities outside business hours as required.
• Collaborate with infrastructure, network, and security teams to support enterprise IT operations and incident response.

Skills

Windows

Linux

Active Directory

Azure AD

PowerShell

Intune

JAMF

ITIL

Documentation

On-call

Tools

Intune

JAMF

PowerShell scripting

Job description

The Systems Administrator is responsible for supporting, securing, and optimizing enterprise IT operations. This includes end-user system support, infrastructure maintenance, IT asset lifecycle management, and leadership of junior team members. The ideal candidate brings strong technical expertise, organizational discipline, and a collaborative mindset to support a modern, scalable, and secure IT environment.,

• Provide hands-on desktop, server, and systems administration support for Windows and Linux environments.
• Install, configure, and troubleshoot hardware and software issues across end-user devices and server systems.
• Administer user accounts, access control, and group policies using Active Directory and Azure AD.
• Manage IT assets throughout their lifecycle: procurement, deployment, support, and decommissioning.
• Ensure proper inventory control, software licensing compliance, and asset tracking using IT asset management tools.
• Generate reports on hardware/software usage, compliance, and asset depreciation for internal and audit needs.
• Lead and mentor junior administrators and support staff; contribute to technical documentation and team training.
• Participate in on-call rotation and perform maintenance activities outside business hours as required.
• Collaborate with infrastructure, network, and security teams to support enterprise IT operations and incident response.
• 3+ years of experience in systems administration or enterprise desktop support roles.
• Strong proficiency in Windows and Linux operating systems.
• Experience with Active Directory, Azure AD, and identity/access management tools.
• Knowledge of networking fundamentals (TCP/IP, DNS, DHCP) and endpoint security practices.
• Familiarity with IT asset management platforms (e.g., SNIPE, JSM, JIRA).
• Ability to participate in an on-call rotation and off-hours maintenance windows.
• Strong documentation, troubleshooting, and customer service skills.
• Excellent communication and collaboration across technical and non-technical teams.
• 5+ years of IT experience, with at least 2 years in a senior or mentoring capacity.
• Experience with Microsoft Endpoint Manager (Intune), JAMF, and scripting in PowerShell.
• Working knowledge of ITIL practices related to change, incident, and asset management.
• Previous experience in asset lifecycle planning and procurement strategy.
• Experience supporting remote and hybrid work environments.
• Industry certifications (e.g., CompTIA, Microsoft, ITIL, Cisco) are a plus.
• Shield AI is a venture-backed defense-tech company with the mission of protecting service members and civilians with intelligent systems. Its products include Hivemind autonomy software, V-BAT and X-BAT aircraft, and Aechelon simulation and synthetic reality technologies. With offices and facilities across the U.S., Europe, the Middle East, and Asia-Pacific, Shield AI's technology actively supports operations worldwide. For more information, visit www.shield.ai.
• Help build the defining defence technology company of this century.
• Work at the forefront of AI, autonomy, and next-generation defence systems.
• Operate in a highly entrepreneurial and mission-driven environment.
• Make a direct impact on international growth and strategic defence partnerships.
• Collaborate with exceptional teams solving some of the world's most complex operational challenges.