Systems Administrator

Title: Systems Administrator

Level: Consultant

Reports to: Managing Director

Location: Canberra-based, embedded full-time on client sites with minimal travel.

Clearance: Minimum NV1 security clearance required; NV2 or higher preferred for some Defence engagements.

About Calexi

There comes a time in every campaign when the dust settles, the noise fades, and you look around to see who is still beside you. That is when you know who you are fighting with and what you are fighting for.

At Calexi, we know that feeling well. We have stood shoulder to shoulder in the toughest places where trust is earned, not issued, and where the margin for error is measured in more than numbers. We are a team built from those moments: people who refuse to quit, who steady their hands when the work gets hard, and who take pride in leaving things better than they found them.

We are more than a consultancy. Yes, we solve complex problems for Defence, government, and industry, but we also build. We design, test, and create systems and technologies that strengthen the digital backbone our nation relies on. Our solutions are shaped by the same curiosity and craftsmanship that define our people: practical, precise, and built to serve something larger than ourselves.

What unites us is not just what we do; it's why we do it. We believe in service without ego, in the power of knowledge shared, and in the quiet confidence that comes from mastering your craft.

This is Calexi forged in purpose, driven by integrity, united by the belief that together we can build a safer, smarter, better world.

Purpose of the Role

The purpose of this role is to maintain, secure, and optimise ICT systems that support Calexi's Defence and government clients.

You will work hands-on across Windows, Linux, and cloud environments to ensure systems remain reliable, patched, and compliant with Australian Government security frameworks.

While primarily focused on operations, you'll also have opportunities to contribute to design and implementation work, strengthening the resilience and performance of mission-critical environments.

Veteran Commitment

Calexi proudly supports Australia's veteran community. We recognise the unique leadership, resilience, and mission-focused mindset that veterans bring to our teams. We actively welcome applications from veterans, reservists, and Defence partners seeking meaningful roles in secure ICT, cyber, and engineering domains.

Key Responsibilities

• Administer, maintain, and secure systems across Windows, Linux, cloud, and hybrid environments.
• Perform patching, updates, monitoring, and backup management to ensure reliability and compliance.
• Apply secure-by-design and Essential Eight principles to all system operations.
• Implement and maintain tools such as SCCM, Intune, Ansible, Puppet, or other automation frameworks.
• Support and troubleshoot issues across servers, virtualisation platforms, and cloud services.
• Contribute to the design, build, and improvement of infrastructure solutions.
• Maintain documentation of configurations, processes, and system changes.
• Uphold compliance with ISM, PSPF, DSPF, and related government frameworks.
• Collaborate within multi-disciplinary teams and communicate effectively with technical and management stakeholders.
• Apply ITIL, Agile, and DevOps approaches to improve reliability, efficiency, and responsiveness.

Level Differentiation

Junior Consultant (Position -1):

Scope: Supports daily operations; performs supervised tasks.

Autonomy / Leadership: Low to medium; growing independence.

Key Outcomes: Reliable system operation and developing technical capability.

Consultant (This Position):

Scope: Independently manages system operations and contributes to design activities.

Autonomy / Leadership: Medium-high; leads small workstreams and mentors others.

Key Outcomes: Secure, stable systems and positive client feedback.

Senior Consultant (Position +1):

Scope: Leads multiple environments and provides specialist expertise.

Autonomy / Leadership: High; provides technical direction with minimal oversight.

Key Outcomes: Improved performance, automation, and innovation in service delivery.

Key Relationships

Internal: Managing Director, Technical Leads, Project Managers, and Calexi project teams.

External: Client stakeholders within Defence and government agencies, typically within multi-disciplinary teams of 2–6 specialists on-site.

Qualifications & Experience

• Bachelor's degree in ICT, Engineering, or a related discipline (or equivalent Defence experience).
• 5–8 years of professional experience in systems administration, infrastructure, or operations.
• Proficiency in one or more of: Windows Server, Linux (RHEL, Ubuntu, etc.), Azure, AWS, or VMware.
• Experience with SCCM, Intune, Ansible, Puppet, or similar automation and configuration tools.
• Understanding of ISM, PSPF, DSPF, and Essential Eight frameworks.
• Certifications such as Microsoft, Red Hat, AWS, Azure, or CompTIA are highly regarded.

Work Level Standards & Conditions

• Salary range: $120,000 – $140,000 + superannuation, depending on skills, experience, and clearance level.
• Includes an annual professional training allowance to support certification and upskilling.
• Embedded full-time on client sites within secure environments.
• Flexible work arrangements may apply subject to client security requirements.
• Strong opportunities for career growth, technical development, and specialisation within Calexi.
• Calexi provides flexibility for Defence Reserve service, family responsibilities, and professional study.

Culture & Belonging

At Calexi, you'll find people who have your back, who push you to grow, trust you to lead, and celebrate your wins as their own. We look after each other because we know what it takes to stand together; and because we know the mission isn't only out there in the field, the code, or the network. It lives in how we show up for one another every day.

Welcome home. Take pride in what you've built and lift your eyes to what comes next. There's still work to be done, and the world needs what we're creating.

Apply here or visit to learn more about our mission-ready team.