Head of IT Infrastructure

The Onset Group; Sydney; On-site; AUD 180,000 - 260,000; Full time

Job summary

The Onset Group is seeking a hands-on Head of IT & Infrastructure in Sydney to own all aspects of the company’s IT and infrastructure. You will drive the strategy, manage networking, cloud, security and on‑premise systems, and partner with engineering teams to ensure reliability and scalable growth.

You will lead the technology roadmap, build out the IT function, and work with vendors to deliver robust, secure and automated infrastructure for a fast‑growing tech business.

Qualifications

• Broad networking and systems administration experience across Linux, Windows, virtualisation and storage.
• Hands-on experience with networking design, switches, routing, firewalls and VLANs.
• Strong identity and access management experience including Entra ID, Active Directory and hybrid environments.

Responsibilities

• Own the design and operation of the network environment including switches, routing, VLANs, firewalls, VPNs and segmentation.
• Manage Linux and Windows environments, servers, virtualisation, storage, backups and disaster recovery.
• Support and improve AWS, DigitalOcean and on‑premise infrastructure with focus on reliability, security and automation.
• Manage Microsoft Entra ID, Active Directory, SSO, MFA, device management and access controls.
• Implement practical security controls and support compliance requirements across the infra.
• Maintain infrastructure supporting engineering teams, including compute resources, CI environments and specialist equipment.
• Take responsibility for infrastructure planning, vendors, budgets, documentation and scaling of the IT function.

Skills

Networking

Linux

Windows

Virtualisation

Storage

Entra ID

Active Directory

Hybrid environments

AWS

Scripting

Automation

Security fundamentals

Ownership

Planning

Engineering support

Kubernetes

Security compliance

Tools

Active Directory

AWS

Job description

Head of IT & Infrastructure | Sydney

Take complete ownership of IT and infrastructure for a fast-growing technology business.

We're partnering with a rapidly scaling technology company where software, hardware and advanced engineering come together.

This is an opportunity for a hands-on infrastructure leader to take full ownership of the systems keeping the entire operation running, from complex networking, cloud and security through to the specialist infrastructure supporting engineering and production.

The business is growing quickly and needs someone who can bring structure, improve reliability and build an infrastructure environment capable of supporting that growth.

You'll have the autonomy to make technical decisions, shape the long-term infrastructure roadmap and build out the IT function as the business expands.

What You'll Be Working On

• Networking: Own the design and operation of the network environment, including switching, routing, VLANs, firewalls, VPNs and network segmentation.

• Infrastructure: Manage Linux and Windows environments, servers, virtualisation, storage, backups and disaster recovery.

• Cloud: Support and improve AWS, DigitalOcean and on-premise infrastructure, with a focus on reliability, security and automation.

• Identity & Endpoints: Manage Microsoft Entra ID, Active Directory, SSO, MFA, device management and access controls.

• Security: Implement practical security controls, improve infrastructure security and support compliance requirements.

• Engineering Systems: Maintain the infrastructure supporting technical teams, including compute resources, CI environments, storage and specialist equipment.

• Strategy & Ownership: Take responsibility for infrastructure planning, vendors, budgets, documentation and scaling the IT function.

What We're Looking For

We're looking for someone with broad technical capability who has experience taking ownership of infrastructure across a business, rather than specialising in just one area.

The key things we're looking for:

• Excellent networking fundamentals, including hands‑on experience configuring switches, routing, firewalls, VLANs and troubleshooting network issues.

• Broad systems administration experience across Linux, Windows, virtualisation and storage.

• Strong Microsoft identity experience, including Entra ID, Active Directory and hybrid environments.

• Experience managing cloud infrastructure, ideally AWS, alongside on‑premise systems.

• Scripting and infrastructure automation experience.

• Good security fundamentals across identity, access, endpoints and infrastructure.

• Experience working in a growing business where you've built, improved or taken ownership of systems yourself.

• The ability to move between hands‑on technical work, problem‑solving and longer‑term infrastructure planning.

Experience supporting engineering teams, specialist technical environments or complex on‑premise infrastructure would be particularly valuable.

Kubernetes, manufacturing systems and formal security compliance experience would also be useful, but aren't essential.

Why Consider This Opportunity?

• Genuine ownership: Take responsibility for how the entire IT and infrastructure environment operates and evolves.

• Build and improve: Design new solutions, modernise existing systems and introduce better ways of working.

• Technical variety: Work across networking, cloud, infrastructure, security and specialist systems rather than being limited to one technology.

• Autonomy: Make decisions, solve problems and shape the future infrastructure environment.

• Growth: Join a scaling business with the opportunity to build and lead a team as the company expands.

• Equity: Competitive base salary plus company equity.

Location: Sydney

If you're currently an Infrastructure Lead, IT Infrastructure Manager, Head of Infrastructure or Senior Infrastructure Engineer looking for greater ownership, we'd be keen to speak.