Systems Administrator

Firmus; Sydney; On-site; AUD 100,000 - 140,000; Full time

Job summary

Firmus Technologies seeks a Senior System Administrator to sustain and secure our regional IT infrastructure across Australia and Singapore. You will manage servers, endpoints, and cloud services, and contribute to security posture and operational efficiency.

You will lead identity and endpoint management, backup and DR, and collaborate with vendors and internal teams. This is a permanent full‑time role requiring hands‑on expertise and travel as needed.

Qualifications

• 5+ years in a System Administrator role in corporate, multi-site environments.
• Degree in Computer Science or IT, or equivalent.
• Hands-on experience with servers, endpoints, and virtualization.
• Experience with hybrid identity and endpoint management (M365, Entra ID, Azure AD, Intune).
• Willingness to travel domestically and internationally.

Responsibilities

• Maintain IT infrastructure across regional offices with focus on security.
• Administer Windows and Linux servers, virtualization platforms and storage.
• Design and operate identity, access, and endpoint management.
• Lead endpoint security and vulnerability management activities.
• Manage backup, DR with Veeam and run restore testing.
• Handle onboarding/offboarding, licenses, and audits.
• Develop documentation, SOPs, and governance artifacts.

Skills

System administration

Hybrid AD & Intune

Security hardening

Vendor coordination

Troubleshooting

Effective communication

Education

Degree in Computer Science / IT

Equivalent professional experience

Tools

VMware

Hyper‑V

Proxmox

Microsoft 365

Entra ID (Azure AD)

Intune

Jira Service Management

Veeam

Milestone VMS

Inner Range

Slack

Job description

Firmus Technologies is a global leader pioneering the development and operation of efficient AI infrastructure across Asia Pacific.

Founded in Australia in 2019, our mission is to create the most efficient AI infrastructure by combining cutting-edge technology with a steadfast commitment to sustainability.

At Firmus, we are unique in our approach. We design, build, and operate a new class of digital infrastructure – the AI Factory. Through our model-to-grid technology approach, we have pushed the boundaries of multi-generational liquid cooling systems, energy management, AI software orchestration, and construction. For our customers, this approach allows us to make every watt count and deliver low-cost AI tokens globally.

Firmus AI Cloud

Our large-scale GPU cloud platform, Firmus AI Cloud, is purpose-built to deliver energy-efficient AI compute at scale to customers.

It empowers developers, enterprises, educational institutions, and government users to train and deploy AI models with unmatched efficiency and cost savings. With an ever-growing suite of services and applications, we are committed to delivering a cloud experience that is market-leading, proprietary, and built to scale.

Why Firmus?

As an NVIDIA Cloud and Engineering partner in Asia Pacific, you will gain skills, experience, and exposure across the AI industry and be part of shaping what this industry looks like for decades to come.

We are founder-led, not a big corporate. Decisions happen fast, our leaders are accessible, and there's minimum bureaucracy between you and the work. Ownership comes early. Whatever your role, you will have a direct line to outcomes, helping shape how the business grows as we scale nationally across a long-term, large-scale roadmap.

Work alongside founders and experts in AI infrastructure, energy systems and next-generation compute.

What we build here has impact beyond the business. Our AI Factories are designed to operate as assets to the energy grid to actively strengthen the communities and regions they operate in rather than drawing from them.

Role Summary

The Systems Administrator plays a critical role in maintaining and securing the IT infrastructure that supports Firmus’ business operations across regional offices. Reporting directly to the Chief Technology Officer (CTO), this position is responsible for the day-to-day administration of servers, network systems, endpoints, cloud services, and enterprise platforms. The role requires a strong hands‑on background in system administration, hybrid Active Directory environments, cybersecurity enforcement, and end‑user support. The Systems Administrator also contributes to strategic technology initiatives, including infrastructure modernisation, security posture improvements, and operational efficiency projects. This position demands a proactive, detail‑oriented individual with the ability to manage complex systems, provide high-quality support, and collaborate effectively across departments and with external vendors.

Key Responsibilities

• Senior technical for Firmus corporate IT environment, supporting regional operations across Australia and Singapore, with accountability for stability, security, and continuous improvement.
• Administer and maintain corporate infrastructure and platforms, including Windows and Linux servers, virtualisation platforms (VMware, Hyper‑V, Proxmox), storage systems, and core corporate services.
• Design, implement, and operate identity, access, and endpoint management across the organisation using Microsoft 365, Entra ID (Azure AD), Intune, and Hybrid Active Directory, ensuring consistent security baselines and least‑privilege access.
• Own and continuously improve endpoint security and threat detection, leveraging Cortex XDR, MFA, and vulnerability management practices in alignment with Firmus security standards.
• Support and maintain corporate security systems, including Milestone VMS and Inner Range access control, ensuring reliable and secure physical access operations.
• Manage backup, recovery, and disaster recovery operations using Veeam, including regular monitoring, restore testing, and validation of recovery readiness.
• IT onboarding and offboarding for corporate staff, covering account provisioning, device issuance and recovery, access reviews, and audit readiness.
• Administer corporate collaboration platforms (e.g. Slack), including user lifecycle management, integrations, and policy enforcement.
• Maintain accurate corporate IT asset registers and ensure software licensing compliance and renewals (e.g. Microsoft, Adobe, Autodesk), including new purchases and vendor coordination.
• Enforce endpoint compliance, configuration standards, and application controls across Windows, macOS, and mobile devices using Microsoft Intune.
• Provide senior‑level operational support through Jira Service Management (JSM), handling escalations, root‑cause analysis, and service improvement actions.
• Monitor infrastructure health and security posture using centralised logging, monitoring, and SIEM platforms, responding to incidents and contributing to threat investigations.
• Contribute to corporate IT improvement initiatives, including system standardisation, security uplift, and operational maturity.
• Develop and maintain high‑quality technical documentation, SOPs, and audit evidence to support governance and compliance requirements.
• Mentor junior IT staff and contribute to building a resilient, well‑structured Corporate IT function at Firmus.

Skills & Experience

• 5+ years’ experience in a System Administrator / Senior System Administrator role within a corporate, multi‑site, or regional IT environment.
• Degree in Computer Science, Information Technology, or equivalent professional experience.
• Strong hands‑on experience managing corporate IT infrastructure, including servers, endpoints, and virtualisation platforms (VMware, Hyper‑V, Proxmox).
• Proven expertise supporting hybrid identity and endpoint environments, including Microsoft 365, Entra ID (Azure AD), Hybrid AD, and Intune.
• Solid understanding of corporate network design, WAN connectivity, and multi‑region operations.
• Demonstrated experience maintaining high availability systems, proactive monitoring, and performance optimisation.
• Strong background in endpoint security and threat detection, including hands‑on experience with Cortex XDR, MFA enforcement, and security hardening. Practical experience with backup and disaster recovery, particularly Veeam, including restore testing and operational readiness.
• Experience working within ITSM frameworks, with hands‑on use of Jira Service Management (JSM).
• Strong troubleshooting, analytical, and root‑cause analysis skills.
• Effective communicator able to engage with technical and non‑technical stakeholders, vendors, and management.
• Experience with vendor coordination is an added advantage.
• Willingness to travel domestically and internationally as required.

Location & Reporting

• Reports to: Chief Technology Office (CTO)

Employment Basis

Permanent full‑time

Diversity

At Firmus, we are committed to building a diverse and inclusive workplace. We encourage applications from candidates of all backgrounds who are passionate about creating a more sustainable future through innovative engineering solutions.