Cyber Security Systems Administrator Location ACT

Working Arrangement Onsite within secure environments.

Clearance Required Minimum NV2 required

Company Overview Cleared has partnered with an advanced radar, sensor and defence provider for Australia's national security. The Cyber Security team maintains secure, resilient platforms and tooling that protect internal systems, networks and operational environments. This role supports the day?to?day operation of core cyber security platforms and contributes to the organisation's security posture across Windows, Linux, virtualisation and containerised environments.

Job Description We are seeking a Cyber Security Systems Administrator to administer, maintain and harden the platforms hosting cyber security capability. The role manages core security tooling, underlying infrastructure and operating systems, ensuring compliance with ISM, Essential Eight ML3 and NIST requirements. You will work across Windows, Linux, virtualisation and container platforms, supporting security investigations, operational activities and Authority to Operate processes.

Administer, maintain, patch and upgrade core security toolsets including vulnerability scanning, SIEM, endpoint protection, application control and privileged access management

Administer virtualisation platforms including cluster health, capacity, VM lifecycle, storage, backup and updates

Administer container platforms including node health, workload deployment, upgrades and registry management

Tune and configure security tooling to balance security efficacy and system performance

Build, harden and maintain Windows and Linux systems underpinning security tooling

Apply OS and application hardening aligned to ISM, Essential Eight ML3 and NIST SP?80053

Administer Privileged Access Management solutions including enrolment, roles, policies and session recording

Enforce tiered administration and least privilege for security tool administration

Develop configuration, hardening, operational and as built documentation





Provide SME input into ATO activities and security assessments

Support security investigations and incidents including data retrieval, queries and containment actions

Operate within formal change management processes

Education/Certifications Required

Bachelor degree or relevant industry certifications

Desirable certifications: RHCSA/RHCE, Security+, Microsoft or vendor certifications

Knowledge/Skills Required

Demonstrated Windows Server and RHEL administration in a security context

Hands on experience with tools such as Nessus, Elastic, Trellix, Airlock Digital or Teleport

Working knowledge of Nutanix and/or OpenShift

Experience with Infrastructure as Code tools such as Puppet, Ansible and Terraform

Experience with container orchestration platforms such as Docker and Kubernetes

Familiarity with security frameworks including ISM, DSPF, NIST and ISO 27001

Understanding of incident response best practices

Desirable experience with Arista and Palo Alto Networks

Key Challenges

Managing competing priorities in a dynamic technical environment

Maintaining solid stakeholder relationships across IT Operations, Cyber Security and external vendors

Defending networks from cyber threat actors

Operating within a complex ecosystem of tools and systems

Building effective automation solutions

Growing technical capability through mentoring and self?directed learning

Employment Requirements

Six month probation period

Medical, psychometric or skills testing may be required

Must comply with company policies, security, safety and quality requirements

Must meet ITAR access requirements

Diversity and Inclusion We welcome applications from candidates of all backgrounds and experiences.

Veterans Defence experience is highly desirable. Veterans are strongly encouraged to apply.

About Cleared At Cleared, we provide tailored recruitment solutions to individuals seeking their next opportunity and to organisations searching for talent within Defence Industry, Intelligence and National Security.

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📌 Cyber Security Linux Administrator (Canberra)
🏢 Client 1
📍 Canberra