Infrastructure Systems Administrator

About the Role

We are seeking a security-cleared Infrastructure Systems Administrator to support a highly secure, mission-critical technology environment. In this role, you will be responsible for maintaining the stability, security, and performance of complex infrastructure systems.

You will work across Windows and Linux platforms, virtualisation technologies, and network environments, ensuring systems meet stringent cybersecurity and operational standards. This position is well-suited to an experienced administrator who thrives in technically complex environments and enjoys collaborating within high-performing teams.

Due to the nature of the end client, an active NV2 security clearance is mandatory for this role.

Key Responsibilities

Ensure the stability, security, efficiency, and scalability of enterprise systems
Administer and maintain Windows Server and Linux (RHEL) environments
Manage core infrastructure services including Active Directory, Group Policy, DNS, and DHCP
Configure, support, and optimise virtualisation platforms (e.g., Hyper-V, VMware)
Manage backup and recovery solutions, including testing and disaster recovery planning
Configure, monitor, and troubleshoot network infrastructure, including switches, routers, and firewalls
Support LAN, WAN, and VPN environments with a strong focus on availability and security
Automate administrative processes using scripting (e.g., PowerShell, Bash)
Provide Level 2/3 support, troubleshoot incidents, and document resolutions
Collaborate with vendors and stakeholders on issues, changes, and ongoing support

About You

Minimum 5 years’ experience in systems administration within medium to large environments
Relevant tertiary qualifications in IT and/or industry certifications
Strong experience with Windows Server and/or Linux systems
Hands-on experience with virtualisation and backup technologies
Solid knowledge of Active Directory, DNS, DHCP, and Group Policy

Requirements

Active NV2 security clearance

Work in a secure, high-impact environment with exposure to complex enterprise infrastructure, alongside a collaborative and technically strong team, in a stable long-term opportunity.