Senior Network Security Engineer

We’re seeking an experienced and technically strong Senior Network Security Engineer to support network security infrastructure. You’ll be responsible for designing, implementing, and maintaining secure, scalable connectivity solutions across our enterprise, helping ensure that critical systems and users remain protected from cyber threats—without compromising performance.

This is a key role within a growing cyber function, working closely with Aurizon’s secure connectivity principal, cloud, server, and other security teams to deliver highly available, compliant, and secure network services.

Build, Design and Manage secure connectivity solutions including VPNs, firewalls, cloud gateways, and application delivery technologies.

Perform system administration and maintenance of connectivity platforms and network security infrastructure.

Implement and manage security protocols, vulnerability assessments, and continuous monitoring across all connectivity services.

Deliver internal and external connectivity services in line with SLAs and IT Service Management frameworks.

Create and maintain network and platform roadmaps to support business evolution.

Lead the development and testing of Disaster Recovery (DR) plans for connectivity solutions.

Maintain comprehensive documentation including architecture diagrams, configurations, and procedures.

Ensure compliance with internal policies and external regulatory requirements.

Provide user training and support on secure connectivity practices.

Partner with technical teams to ensure efficient and secure integrations across cloud and on-prem environments.

Respond to security incidents, maintain incident readiness tools, and support remediation activities.

Participate in post-incident reviews and implement improvements to harden infrastructure.

Fulfil on-call responsibilities as part of a rotating team roster.

Tertiary qualification in IT, Networking, Engineering, or a related field (mandatory).

One or more relevant certifications, such as CISSP, CCNP, CCIE, Azure Network Engineer Associate, or vendor certifications in Palo Alto, CheckPoint, F5, or Cisco (mandatory).

7+ years’ experience in network security roles within large enterprise environments.

Deep expertise in designing and managing next-generation firewalls and secure networking solutions.

Advanced skills in Cisco switching/routing and Meraki technologies.

Strong working knowledge of Azure networking, API security, and VPN gateway configuration.

Solid scripting experience (PowerShell, Python, iRule) to support automation and integration.

Excellent communication skills with a strong ability to work across teams and manage stakeholder expectations.

Familiarity with MITRE ATT&CK, deception technologies, and secure administration across Windows/Linux/Azure environments (preferred).

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Aurizon is Australia’s largest rail freight operator and a top 100 ASX company. Each year, we deliver more than 250 million tonnes of Australian commodities right across the country. Aurizon is crucial to the Australian economy, connecting miners, primary producers and industry with international and domestic markets.

At Aurizon, we are proud of our diverse, collaborative, creative and high-performance culture. We celebrate the contribution of every employee and provide opportunities for career development in a dynamic, caring, and inclusive work environment.

To learn about us and our company values, please visit www.aurizon.com.au/careers