Head of IT & Infrastructure — Own Cloud, Security, Equity

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

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.