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Permanent | Highly Secure Environment | NV1 (or ability to obtain)
Our client is a major national provider supporting some of Australia's most security‑conscious customers. They are seeking a Senior Security Systems Engineer to join a specialised team responsible for building, maintaining, and securing a protected ICT environment as it progresses through a formal accreditation program.
This is a hands‑on technical role suited to someone who enjoys end‑to‑end ownership of secure systems, working across Windows, Linux, virtualisation, automation, and SIEM/SOAR integrations. You will play a key part in preparing a classified environment for accreditation, enhancing security maturity, uplifting observability, and supporting threat‑led operational improvements.
Location: Melbourne
Work Arrangements: Hybrid Working
Salary: $160,000 plus super
Interview dates: Ideally week commencing 5th of January
What You'll Be Doing
* Work closely with operational, infrastructure and security engineering teams to deliver a secure, compliant ICT environment.
* Operate, maintain and harden Windows, Linux (RHEL/CentOS) and virtualisation platforms (VMware/Hyper‑V).
* Administer Active Directory, Group Policy, identity federation and role‑based access controls.
* Perform patching, vulnerability management, system hardening and remediation activities aligned to IRAP, ASD and vulnerability findings.
* Monitor and respond to system alerts, logs and performance issues, integrating with SIEM/SOC operations.
* Manage storage, backup solutions, encryption, data integrity and compliance requirements.
* Automate routine tasks using PowerShell, Bash or Python to reduce risk and improve efficiency.
* Support the full lifecycle of the environment, including decommissioning legacy apps and uplifting systems to accreditation requirements.
* Contribute to accreditation documentation such as SSPs, risk treatment plans and baseline configurations.
* Mentor junior team members and participate in on‑call rotations for a highly technical environment.
* Engage with stakeholders across the business, supporting change, planned works, and continuous improvement initiatives.
What You'll Bring
Essential
* NV1 security clearance or the ability to obtain one quickly.
* Strong experience across Windows, Linux, system integration, and secure configuration.
* Solid understanding of cybersecurity principles and how to apply them across build, operations, and maintenance.
* Experience implementing and maintaining controls aligned to frameworks such as ISO 27001, NIST, IRAP, ISM or the Essential Eight.
Desirable
* Exposure to Network Detection and Response platforms, SIEM/SOAR integration, sensors/agents, or security analytics tooling.
* Experience with Citrix or virtual desktop environments.
* Previous involvement in IRAP, DISP, ISM or other compliance/accreditation projects.
If you are interested in this role, please click Apply today or reach out to Sophie Garrison for more info:
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