Systems Administrator (R5064)

Shield; Greater London; On-site; GBP 42,000 - 64,000; Full time

Job summary

Shield AI seeks a Systems Administrator to support, secure, and optimize enterprise IT operations across Windows and Linux environments. The role includes hands-on administration, asset lifecycle management, and mentoring junior staff in a modern, scalable IT setup.

You will collaborate with infrastructure, network, and security teams, participate in on-call rotations, and contribute to technical documentation and training, ensuring compliance and service reliability.

Qualifications

• 3+ years of systems administration or enterprise desktop support.
• Proficient in Windows and Linux operating systems.
• Experience with AD, Azure AD and IAM tools.
• Solid networking fundamentals and security practices.
• Familiarity with IT asset management platforms.

Responsibilities

• Provide hands-on desktop, server, and systems administration support for Windows and Linux environments.
• Install, configure, and troubleshoot hardware and software across end-user devices and server systems.
• Administer user accounts, access control, and group policies using Active Directory and Azure AD.
• Manage IT assets lifecycle: procurement, deployment, support, and decommissioning.
• Ensure inventory, licensing compliance, and asset tracking using ITAM tools.
• Lead and mentor junior admins; contribute to documentation and training.

Skills

Windows OS

Linux OS

Active Directory

Azure AD

Networking basics

IT asset management

On-call support

Documentation

Collaboration

Customer service

Tools

SNIPE

JSM

JIRA

Intune

JAMF

Job description

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-BATaircraft, 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. Follow Shield AI on LinkedIn, X, Instagram, and YouTube.

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.

What you’ll do:

• 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.

Required qualifications:

• 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.

Preferred qualifications:

• 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.

Why join 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.

Our international teammates receive a comprehensive total rewards package aligned to your country office location. For full details on compensation and benefits, please consult your talent acquisition partner.