Role: System Administrator
Location: Torrensville, South Australia
Security Clearance: Active NV1 (mandatory)
About the Organisation
A South Australian–based organisation operating within the defence and advanced technology sector, delivering secure, high-reliability solutions to government and industry. The organisation maintains a strong focus on security, compliance, and continuous improvement across its internal ICT environment.
Role Overview The System Administrator is responsible for the end-to-end management of the organisation's internal ICT systems. This includes cloud and Microsoft platforms, server and virtualisation environments, networking infrastructure, security operations, and end-user computing.
This role plays a key part in ensuring system availability, security compliance, and operational efficiency within a regulated, security-conscious environment.
Key Responsibilities Cloud & Microsoft Platforms
* Administer, maintain, and support Microsoft cloud services including:
* Microsoft Teams
* Microsoft Entra ID (Azure AD)
* SharePoint Online
* Exchange Online / Outlook
* Microsoft security and compliance services
* Manage user accounts, access permissions, group membership, and security policies
* Monitor system health, availability, and usage and respond to incidents as required
Email & Messaging Security
* Administer and maintain Mimecast, including:
* Email filtering and threat protection
* Policy configuration and optimisation
* Monitoring and responding to email security incidents
* User administration and reporting
Server, Virtualisation & Unix Systems
* Administer internal Unix/Linux environments including:
* Proxmox virtualisation infrastructure
* Ubuntu servers (virtual and physical)
* Perform system patching, updates, configuration management, and monitoring
* Troubleshoot system faults and implement corrective actions
* Maintain system documentation and configuration records
Internal Systems & Services
* Support and maintain internal systems including:
* Jenkins
* Gitea
* OpenVPN
* Security and authentication services
* Ensure services are secure, available, and correctly configured
* Support development, integration, and automation environments where required
Networking Infrastructure
* Administer and maintain switches, routers, firewalls, and VPNs
* Monitor network performance and reliability
* Diagnose and resolve network and connectivity issues
* Assist with implementation and maintenance of network security controls
End-User Computing & Hardware
* Order, configure, deploy, and maintain laptops, desktops, and ICT hardware
* Build systems in line with organisational standards
* Manage device lifecycle activities including upgrades, replacements, and decommissioning
* Provide technical support to end users, including fault diagnosis and issue resolution
Backup & Recovery
* Administer and monitor backup and recovery systems
* Verify backup integrity and support restoration activities
* Ensure backup processes meet compliance and organisational requirements
IT Security & Compliance
* Support security operations including:
* User and system access controls
* Privileged access management
* Security access requests
* Contribute to compliance with:
* Essential Eight
* DISP (Defence Industry Security Program)
* Internal ICT security policies
* Assist with audits, reviews, and security improvement initiatives
Continuous Improvement
* Identify risks, inefficiencies, and improvement opportunities
* Implement system, process, and security enhancements
* Contribute to automation and standardisation initiatives
Supplier & Asset Management
* Liaise with ICT suppliers and service providers
* Coordinate procurement of hardware and services
* Maintain accurate ICT asset registers
* Ensure effective asset lifecycle management
Skills & Experience Essential:
* Active NV1 security clearance
* Strong experience in Microsoft 365 and cloud-based systems
* Linux/Unix system administration experience
* Virtualisation experience (Proxmox or similar)
* Networking fundamentals (firewalls, VPNs, routing, switching)
* Experience supporting secure or regulated environments
Desirable:
* Defence industry experience
* Familiarity with Essential Eight and DISP requirements
* Experience with automation, CI/CD tools, or DevOps environments
We are an inclusive employer committed to fostering a diverse and accessible workplace. We encourage applications from Aboriginal and Torres Strait Islander peoples, people with disabilities, LGBTQIA+ individuals, people of all ages, and those from culturally and linguistically diverse backgrounds.