Cyber Security Linux Administrator

Cleared ICT; Canberra; On-site; AUD 90,000 - 130,000; Full time

Job summary

Cleared is 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.

Qualifications

• Bachelor degree or relevant industry certifications.
• Experience securing Windows and Linux platforms in a regulated environment.
• Hands-on with Nessus, SIEM, and container security tooling.

Responsibilities

• Administer, patch and upgrade core security toolsets including vulnerability scanning and privileged access management.
• Manage virtualization and container platforms, node health and deployments.
• Develop and enforce security hardening aligned to ISM, Essential Eight ML3 and NIST SP 800-53.
• Support ATO activities, security investigations and incident containment.

Skills

Windows Server administration

RHEL administration

Incident response

Nessus / vulnerability scanning

Security monitoring (SIEM)

Container security (Docker/Kubernetes)

Privileged access management

Education

Bachelor degree in IT or related field

RHCSA/RHCE

Security+ or equivalent

Tools

Nutanix

OpenShift

Puppet

Ansible

Terraform

Job description

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.

Duties and Responsibilities

• 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


• Managing competing priorities in a dynamic technical environment


• Maintaining strong 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


• Growing technical capability through mentoring and self?directed learning

Employment Requirements

• 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.