Senior Systems Administrator

Cleared ICT; Brisbane; On-site; AUD 130,000 - 170,000; Full time

Job summary

Cleared is partnering with a leading global technology and defence organisation to recruit a Senior IT Administrator to support enterprise network, infrastructure and datacentre environments across Australia. This role blends hands-on administration with a strong networking focus to ensure secure, highly available IT services.

You will design, implement, and maintain critical network and infrastructure systems, including Windows Server, virtualization, cloud services and security controls in

Qualifications

• Extensive experience in enterprise network administration and systems administration.
• Strong knowledge of routing, switching, firewall technologies and infrastructure operations.
• Experience supporting Windows Server environments and virtualised infrastructure.
• Exposure to cloud technologies, cybersecurity frameworks and operational security practices.
• Experience with Aruba networking, Check Point firewalls and Cisco switching is highly regarded.
• Strong troubleshooting, stakeholder engagement and documentation skills.

Responsibilities

• Lead the design, implementation and maintenance of network and infrastructure systems.
• Administer Windows Server infrastructure and virtualised environments.
• Support LAN, WAN and firewall environments across sites.
• Support vulnerability management, patching and remediation activities.
• Collaborate with international teams on SIEM, EDR and incident response initiatives.
• Deliver infrastructure and application rollout projects.
• Provide Level 2 and Level 3 support across Australian offices.
• Participate in occasional domestic travel and international collaboration.

Skills

Enterprise network administration

Systems administration

Routing and switching

Firewall technologies

Windows Server

Cloud technologies

Cybersecurity frameworks

Aruba networking

Check Point firewalls

Cisco switching

Troubleshooting

Stakeholder engagement

Documentation

Education

Tertiary qualifications or equivalent experience

Tools

VMware

Hyper-V

Aruba networking tools

Check Point management tools

Cisco networking gear

Job description

Brisbane | Permanent | NV1 Eligible

Cleared is partnering with a leading global technology and defence organisation seeking a Senior IT Administrator to support and enhance enterprise network, infrastructure and datacentre environments across Australia.

This role is ideal for an experienced infrastructure professional with strong networking expertise who enjoys working across complex, security-focused environments.

About the Role

You will be responsible for the design, implementation, support and ongoing maintenance of critical network and infrastructure systems. The position combines hands‑on systems administration with a strong networking focus, ensuring secure, highly available and high‑performance IT services across multiple locations.

Key Responsibilities

• Lead the implementation and support of LAN, WAN and firewall environments.
• Administer Windows Server infrastructure, virtualisation platforms and cloud services.
• Support enterprise backup, recovery and disaster recovery testing activities.
• Implement and maintain security controls aligned with DISP and ISO 27001 requirements.
• Support vulnerability management, patching and remediation activities.
• Collaborate with international teams on SIEM, EDR and incident response initiatives.
• Deliver infrastructure and application rollout projects.
• Provide Level 2 and Level 3 support across Australian offices.
• Participate in occasional domestic travel and international collaboration.

Skills & Experience

• Extensive experience in enterprise network administration and systems administration.
• Strong knowledge of routing, switching, firewall technologies and infrastructure operations.
• Experience supporting Windows Server environments and virtualised infrastructure.
• Exposure to cloud technologies, cybersecurity frameworks and operational security practices.
• Experience with Aruba networking, Check Point firewalls and Cisco switching is highly regarded.
• Strong troubleshooting, stakeholder engagement and documentation skills.

Requirements

• Ability to obtain an NV1 Security Clearance.
• Experience working within secure or regulated environments is advantageous.
• Relevant tertiary qualifications or equivalent industry experience.

Diversity and Inclusion

Our client is committed to fostering an inclusive workplace and welcomes applications from people of all backgrounds, cultures, genders, abilities and experiences.

Veterans

Veterans and ex-serving Australian Defence Force personnel are encouraged to apply, with cyber security and government experience highly regarded.

About Cleared

Cleared is a specialist recruitment partner focused on Australia's Defence, National Security and Federal Government sectors. We connect security-cleared professionals with mission‑critical opportunities across cyber security, ICT, intelligence and engineering.