Systems Administrator

About Leidos Australia

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. Backed by a global organisation of more than 40,000 people, our Australian team of around 2,000 has partnered with government, defence and national security customers for more than 30 years. We deliver mission critical solutions where reliability, trust and purpose matter. Leidos is a destination for people who want their work to have purpose, their contribution to be recognised, and their career to grow without needing to fit a single mould.

Meaningful work is supported by benefits, flexibility and career pathways that help you grow while balancing life outside work. This includes:

• 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.


• And Much More - These are just a few of the ways we invest in our people and help them thrive.

About the Team

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. We deliver prime systems integration projects which build, develop and support military solutions for Defence. The team focuses on leveraging our local engineering, our services expertise, and global products to bring new capabilities to the Australian Defence Force.

The Opportunity

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.

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.

About You

We are looking for a technology professional who enjoys working in secure and complex ICT environments where reliability, collaboration, and technical expertise directly contribute to Defence capability outcomes. You will bring a customer focused approach, sound systems administration experience, and the ability to work across a diverse technology landscape supporting mission critical networks and services. Essential 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.

Advantageous Experience:

• containerisation technologies, including Docker and container management platforms.


• PowerShell scripting and automation to improve operational efficiency and reduce manual administration activities.


• Thin client technologies and virtual desktop environments.


• Microsoft Endpoint Configuration Manager (MECM/SCCM) or related endpoint management solutions.


• Networking concepts including TCP/IP, VLANs, VPNs, routing, switching, firewall technologies, and secure network operations.


• Tactical Data Link, Defence networking, interoperability testing, systems integration, or secure communications environments.


• ITIL Foundation certification or a comparable IT Service Management qualification.


• Microsoft certifications such as Windows Server Hybrid Administrator Associate, Azure Administrator Associate, or equivalent.


• Citrix Certified Associate (CCA) certification or a higher level Citrix accreditation.

This position requires a minimum NV2 Security Clearance.

Pay Range

Pay Range: The Leidos pay range for this job level is a general guideline only and not a guarantee of compensation or salary. Additional factors considered in extending an offer include (but are not limited to) responsibilities of the job, education, experience, knowledge, skills, and abilities, as well as internal equity, alignment with market data, applicable bargaining agreement (if any), or other law.

Pay and Benefits

• Employment benefits include competitive compensation, Health and Wellness programs, Income Protection, Paid Leave and Retirement.

Securing Your Data

Leidos will never ask you to provide payment related information at any part of the employment application process. And Leidos will communicate with you only through emails that are sent from a email address. If you receive an email purporting to be from Leidos that asks for payment related information or any other personal information, please report the email to .

Commitment and Diversity

All qualified applicants will receive consideration for employment without regard to sex, race, ethnicity, age, national origin, citizenship, religion, physical or mental disability, medical condition, genetic information, pregnancy, family structure, marital status, ancestry, domestic partner status, sexual orientation, gender identity or expression, veteran or military status, or any other basis prohibited by law. Leidos will also consider for employment qualified applicants with criminal histories consistent with relevant laws.