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
- Microsoft Teams
- 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
- Email filtering and threat protection
Server, Virtualisation & Unix Systems
- Administer internal Unix/Linux environments including:
- Proxmox virtualisation infrastructure
- Ubuntu servers (virtual and physical)
- Proxmox virtualisation infrastructure
- 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
- Jenkins
- 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
- Support security operations including:
- User and system access controls
- Privileged access management
- Security access requests
- User and system access controls
- Contribute to compliance with:
- Essential Eight
- DISP (Defence Industry Security Program)
- Internal ICT security policies
- Essential Eight
- Assist with audits, reviews, and security improvement initiatives
- Identify risks, inefficiencies, and improvement opportunities
- Implement system, process, and security enhancements
- Contribute to automation and standardisation initiatives
- Liaise with ICT suppliers and service providers
- Coordinate procurement of hardware and services
- Maintain accurate ICT asset registers
- Ensure effective asset lifecycle management
- 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
- 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.
