Senior Security Systems Engineer

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 - ESSENTIAL

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 cyber security 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: ***email_hidden***