Systems Administrator

At Leidos Australia, our work goes beyond a job title. We design, build, operate and support the systems, services and capabilities that help protect and advance the Australian way of life.

You’ll join a team where people work with integrity, inclusion, innovation, agility, collaboration and commitment. In practice, that means sharing ownership, solving complex problems together and staying connected to the customer context, the purpose behind the work and how each role contributes to meaningful outcomes.

As a Systems Administrator, you will play a key role in supporting a strategically important Defence capability that delivers technical staffing and specialist expertise across three interconnected Tactical Data Link (TDL) and network engineering projects. Supporting Joint Command and Control (JC2) and Joint Data Network (JDN) environments, you will contribute to the delivery of critical testing, interoperability, accreditation, and network design activities that enable Defence operational effectiveness.

Responsibilities:

• Support and administer enterprise Windows Server, Linux, virtualisation, and VDI environments that underpin Tactical Data Link, platform, and software testing activities across a multi-project Defence program.
• Maintain and enhance critical infrastructure technologies including Active Directory, VMware ESX, Hyper-V, Omnissia Horizon, Citrix Virtual Apps and Desktops, storage, backup, and recovery solutions to ensure secure, reliable, and resilient service delivery.
• Collaborate with Defence stakeholders, technical specialists, vendors, and project teams to support TDL interoperability requirements, Joint Data Network capabilities, Link 16 network design activities, and ongoing technology refresh and continuous improvement initiatives.
• Contribute to infrastructure projects, disaster recovery exercises, cyber security compliance activities, and operational support functions while working within a highly secure environment aligned to Whole of Australian Government ICT security requirements and Defence accreditation frameworks.

Benefits:

• Flex Your Way – Tailor work to your life with options including Life Days (up to 12 extra days off per year), part-time arrangements, job sharing, and compressed hours.
• Wellbeing That Matters – Free access to Headspace and MeQuilibrium, plus dedicated wellness spaces to support your mental, physical, and emotional wellbeing.
• Learn Without Limits – Access over 120,000 on-demand courses, alongside technical, project management, leadership, and professional development opportunities.
• Work That Makes an Impact – Contribute to nationally significant projects that matter, solve complex challenges, and accelerate your career through unique growth opportunities.
• Build Your Future – Whether you're deepening technical expertise or preparing for leadership, we'll invest in your development every step of the way.

Requirements:

• Experience supporting and administering Microsoft Windows Server and Linux environments within complex enterprise ICT environments.
• Knowledge of Active Directory, Group Policy, DNS, DHCP, and multi-domain environments, including administration, maintenance, and troubleshooting.
• Experience maintaining and supporting enterprise server, desktop, and infrastructure platforms within medium to large organisations.
• Capability in administering and supporting Microsoft Hyper-V and VMware ESX environments, including virtual machine provisioning, lifecycle management, and troubleshooting.
• Experience supporting Omnissia Horizon, Citrix Virtual Apps and Desktops, or similar virtual desktop infrastructure technologies.
• Experience with enterprise storage, backup, and recovery solutions, ideally including NetApp storage and Veeam Backup & Replication.
• Demonstrated analytical and problem-solving capability, with the ability to diagnose and resolve complex technical issues across infrastructure, virtualisation, and end-user computing environments.
• Well-developed written and verbal communication skills, with the ability to engage effectively with customers, technical teams, and Defence stakeholders.
• Understanding of Whole of Australian Government ICT security requirements, ACSC Information Security Manual (ISM) controls, cyber assurance frameworks, and secure operating environments.
• Ability to work independently while contributing effectively within a multidisciplinary team supporting multiple projects and competing priorities.