Infrastructure Lead: Own the IT & Growth (Sydney)

The Onset Group; Sydney; On-site; AUD 170,000 - 250,000; Full time

Benefits offered by this job

Equity

Job summary

The Onset Group is seeking a hands-on Infrastructure Lead in Sydney to own the entire IT and infrastructure stack. You will manage networking, cloud and on‑premise systems, and drive security, reliability and automation across the tech stack.

You'll shape the long-term infrastructure roadmap, oversee budgeting and vendor management, and build out the IT function as the business scales. This role requires broad capability and ownership mindset.

Qualifications

• Networking fundamentals with hands-on config of switches, routers, firewalls, VLANs
• Broad systems administration across Linux/Windows, virtualization and storage
• Strong Entra ID and Active Directory experience
• Cloud infrastructure experience, especially AWS
• Scripting and infrastructure automation experience
• Security fundamentals for identity, access, endpoints and infra
• Experience growing a business with ownership of systems
• Ability to balance hands-on work and long-term infrastructure planning

Responsibilities

• Own design and operation of the network environment, including switches, routing, firewalls, VLANs
• Manage Linux and Windows environments, servers, virtualization, storage, backups and disaster recovery
• Support and improve AWS 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, improve infrastructure security and support compliance requirements
• Maintain the infrastructure supporting engineering teams, including compute resources, CI environments, storage and specialist equipment
• Take responsibility for infrastructure planning, vendors, budgets, documentation and scaling the IT function

Skills

Networking

Linux Admin

Windows Admin

Entra ID/AD

Cloud (AWS)

Automation/Scripting

Security basics

Hybrid infra

Tools

AWS

On-Prem Infra

Job description

The Onset Group is seeking a hands-on Infrastructure Lead in Sydney to own the entire IT and infrastructure stack. You will manage networking, cloud and on‑premise systems, and drive security, reliability and automation across the tech stack.

You'll shape the long-term infrastructure roadmap, oversee budgeting and vendor management, and build out the IT function as the business scales. This role requires broad capability and ownership mindset.