Senior System Administrator - Linux
Location: Canberra, ACT (On‐premises only)
Security: Australian Citizen – NV2 clearance
Employment Type: Permanent
About our Client
They are a mission-driven technology organisation delivering secure, scalable data solutions across highly regulated and critical environments.
Their work supports complex, high-impact programs spanning government, defence-aligned initiatives, healthcare, and commercial sectors.
As a growing and creative business, they pride themselves on building high-performing teams that value ownership, curiosity, trust, and technical excellence.
This is an opportunity to join an organisation where your work directly contributes to systems that matter.
About the Role
We are seeking a highly experienced
Principal System Administrator
to lead the design, deployment, and maintenance of secure data management platforms within defence-aligned environments.
This is a senior technical leadership role where you'll take ownership of critical infrastructure, ensuring secure, compliant, and high-performing IT operations.
Reporting directly to the President, you will play a key role in shaping system architecture, driving operational excellence, and supporting secure environments across multiple on-premises sites.
Key Responsibilities
Architect, deploy, and maintain a resilient Linux server environment
Manage Active Directory, Group Policy, identity & access management (IAM) and network configurations
Configure and support firewalls, routers, switches, VLANs, DNS, and IAM integrations
Lead system lifecycle activities including installation, configuration, testing, and troubleshooting
Provide end-user support, resolving technical issues and access challenges
Oversee patch management, compliance, change control, and vulnerability remediation




Implement system hardening aligned with Essential Eight and conduct regular security audits
Maintain and optimise production Kubernetes (K8s) clusters, including deployment, scaling, monitoring (Prometheus/Grafana), and troubleshooting
Collaborate with internal teams and external stakeholders, delivering technical insights and recommendations to leadership
Provide technical leadership and mentorship to engineering teams
About You
You are a highly skilled systems professional who thrives in secure, complex environments and demonstrates leadership, accountability, and curiosity.
Essential Experience & Skills
Minimum
10 years' experience
in system administration or IT infrastructure
Strong expertise in
Linux system administration and Active Directory
Proven experience with
networking (CCNA/CCNP or equivalent hands-on experience)
Proficiency in scripting (
PowerShell, Bash, Python
)
Experience managing
Kubernetes environments in production
Deep understanding of
security frameworks and system hardening practices
Strong
analytical and troubleshooting
capability
Demonstrated experience
leading or mentoring technical teams
Qualifications & Requirements
Relevant tertiary qualification or equivalent practical experience
Willingness to
travel across Australia
to customer and partner sites (including secure environments)
Australian citizenship with an
AGSVA NV2 security clearance
How to Apply
Please upload your resume to apply.
We will be in touch with further instructions for suitably skilled candidates.
Call Katrina Gabriel on ******** *** or email ***email_hidden*** for any further information.
Candidates will need to be willing to undergo pre-employment screening checks which may include, ID and work rights, security clearance verification and any other client requested checks.

📌 Senior System Administrator (Canberra)
🏢 JobRadars - AU
📍 Canberra