System Administrator

Job Description

Role Description

The System Administrator reports to the Director of IT & AI and sits within a small IT team. The role is responsible for the design, operation, security, and continuous improvement of the organisation’s corporate IT environment. This spans on-premises and cloud infrastructure, Microsoft and Linux platforms, identity and access management, SaaS integrations, endpoint fleet management, and internal engineering compute clusters.

The role is both hands-on and enabling, keeping day-to-day operations running reliably while helping engineering and business teams adopt new technologies, tools, and workflows safely. The successful candidate will act as a technical escalation point (L2/L3) for the service desk and will contribute to governance, disaster recovery, and cybersecurity initiatives across the business.

Key Responsibilities:

Infrastructure & Operations

• Administer Windows Server environments, including Group Policy, DNS, DHCP, file and certificate services.

• Provide L2/L3 operational support, resolving escalations from the Service Desk and complex infrastructure incidents.
• Mentor and support L1/L2 Service Desk staff, building their technical capability.

• Prioritise tickets in the infrastructure queue, ensuring incidents and requests are resolved within agreed SLAs.
• Administer Microsoft 365, including Exchange, Teams, SharePoint, and Intune.
• Manage endpoint provisioning and lifecycle for a globally distributed workforce across Windows, macOS, and Linux.
• Administer VMware and Linux compute clusters and AWS environments, including capacity planning and performance management.
• Maintain VPN infrastructure for remote and on-site personnel.
• Administer network configuration for Brisbane HQ and remote sites (switching, routing, firewalls, wireless).
• Own DR and business continuity initiatives, including backups, restore testing, and infrastructure resilience.
• Enable teams to safely adopt new technologies and workflows, including internally developed tools.
• Support the secure adoption and governance of AI tools and services across the business, including access controls, data protection, and integration with existing platforms.

Identity & Access Management

• Maintain Active Directory and Microsoft Entra ID, SSO, MFA, Conditional Access, and hybrid identity sync.
• Improve access management through Entra ID integrations with SaaS platforms and AWS (SAML/OIDC/SCIM), including automated provisioning and deprovisioning.
• Implement least-privilege RBAC and manage the joiner/mover/leaver process; conduct periodic access reviews.

Cybersecurity

• Enforce endpoint security policies across Windows, macOS, and Linux using Intune, Defender, and equivalent tooling.
• Own patch management and vulnerability management across servers, endpoints, and network devices.
• Maintain firewalls, email security (DMARC/DKIM/SPF), web filtering, and endpoint detection and response.
• Monitor security alerts, investigate and contain incidents, and support penetration test remediation.
• Harden systems against recognised baselines (CIS, Microsoft baselines, ASD Essential Eight).
• Support cybersecurity governance, risk, and compliance initiatives.

Governance

• Maintain documentation, network topology, and the asset register.
• Operate and improve change management, including risk assessment, approvals, and rollback planning.
• Contribute to IT policies and standards and support audits and compliance.
• Track licensing compliance, maintain the IT risk register, and contribute to DR/BC planning (RTO/RPO, DR exercises).
• Contribute to and uphold the organisation’s AI policy.

Skills & Experience

• 5+ years in systems administration within a mixed Windows/Linux enterprise environment.
• Windows Server, Active Directory, and Microsoft Entra ID, including Group Policy, DNS/DHCP, certificate services, Conditional Access, MFA, and hybrid identity.
• Microsoft 365: Exchange Online, Teams, SharePoint, Intune.
• Linux administration (Ubuntu and/or RHEL-based).
• VMware vSphere/ESXi and AWS, including cluster and capacity management.
• Networking and network security: TCP/IP, VLANs, routing, switching, firewalls, enterprise Wi-Fi, VPN.
• Scripting and automation in PowerShell, Bash, or Python.
• Clear written and verbal communication, including explaining technical issues and risks to non-technical stakeholders.
• Strong documentation discipline: runbooks, network diagrams, change records.
• Strong understanding of AI tools and their security, privacy, and data governance implications.

Are you interested in this position?
Apply by clicking on the “Apply Now” button below!
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