Network Administrator – Adelaide

About Us

For over 35 years, GPA Engineering has been a trusted, Australian-owned consultancy delivering engineering, procurement and construction management services across water, energy, renewables, defence, mining, and hydrogen. We develop and implement projects that drive critical infrastructure and support industries across Australia.

With offices nationwide (Adelaide, Brisbane, Melbourne, Sydney, Darwin, Perth) and a reputation for technical excellence, our strength lies in our people. We bring together diverse, motivated professionals who value teamwork, integrity, safety, and sustainability. At GPA, you’ll find the scale and expertise of a leading consultancy, combined with the supportive culture of a close-knit team.

About the Role:

GPA Engineering is seeking a Network Administrator to support, maintain, and continually improve our enterprise network and security infrastructure across multiple sites. Working with the internal IT team, you will keep the corporate network secure, high-performing, and highly available.

• Part of the recruitment process for this position, is to provide a guided 2-3 minute video introduction of yourself (via Willo), a link to the Willo portal will be shared with you if your application is successful in the first instance.

Key Duties

• Administer Palo Alto Networks next-generation firewalls (physical and virtual) through Panorama, including security policies, application and user-based controls, web filtering, NAT, and site-to-site and remote access VPN.
• Maintain and tune the software-defined WAN — traffic policy optimisation, performance troubleshooting, ISP transitions, office relocations, and infrastructure refresh projects.
• Administer the enterprise switching, wireless, and cellular/WAN failover environments, including routing, VLANs, layer 2 resilience, link aggregation, enterprise and guest wireless, and branch connectivity.
• Configure and maintain core network services: DNS, DHCP, certificate services, and network authentication.
• Perform firmware upgrades, security patching, licensing, and routine maintenance across all network platforms, and monitor network health and performance using enterprise and cloud-based tools.
• Respond to network incidents, perform root cause analysis, and maintain accurate documentation, diagrams, and standard operating procedures.
• Implement and maintain network security controls aligned to our certified Information Security Management System, and contribute to infrastructure and continuous improvement projects.

Skills & Experience

We are seeking a reliable, adaptable professional who thrives in a collaborative team environment. To be successful in this role, you will bring the following essential skills and experience:

• Demonstrated experience administering enterprise network infrastructure across multiple sites.
• Hands-on experience with Palo Alto Networks next-generation firewalls and Panorama.
• Strong grounding in network fundamentals — TCP/IP, routing, switching, VLANs, NAT, DNS, DHCP, VPN and tunnelling, and network security principles.
• Experience supporting enterprise wireless networking and wireless security.
• Strong troubleshooting skills, the ability to prioritise and work independently, and clear written and verbal communication.

Desirable skills

• Palo Alto Panorama SD-WAN deployments; PCNSA, PCNSE, or equivalent certifications.
• Microsoft server and identity infrastructure (directory services, cloud identity, certificate services, virtualisation, clustering).
• Cloud-based network management, infrastructure automation, and endpoint protection / threat detection platforms. 

A requirement for this role is to complete a satisfactory Australian police clearance.

What we offer:

At GPA, we want our people to thrive – both professionally and personally. We’re big enough to deliver complex, high-profile projects, yet small enough that you’ll always feel valued and supported.

• Competitive Salary & Rewards – a fair and attractive compensation package with paid overtime, recognising the value of the work you put in.
• Career Growth & Development – company-sponsored training, and support towards professional membership.
• Flexibility – flexible working options and cultural leave swap days, because we know work-life balance matters.
• Health & Wellbeing – wellbeing programs, confidential EAP support, and a culture that genuinely looks out for each other.
• Family-Friendly Benefits – paid parental leave for both primary and secondary carers, plus policies that support every stage of life.
• Community & Culture – a workplace that values connection and fun, from weekly sports teams and fitness clubs through to social events like cinema nights, family BBQs, quiz nights, and celebrations of diverse cultural traditions.
• Giving Back – a strong commitment to charity, with GPA donating over $3 million directly to charitable organisations.
• Diversity & Inclusion – a team where different perspectives are respected and collaboration drives better outcomes.

At GPA, we offer a supportive working environment with opportunities for career development. We’re proud that over 80 of our team members have been with us for more than 10 years – a testament to the career growth and long-term commitment fostered here.  Hear directly from our team and explore their experiences in our employees testimonials: https://www.gpaeng.com.au/careers/

GPA is an equal opportunity employer and welcomes applications from people of all backgrounds and experiences.

How to Apply

Ready to take the next step in your career? We’d love to hear from you. Submit your application online before 28th September 2026 and one of our team will be in touch.

If you require adjustments to the recruitment process to support your application, you may email us at HR@gpaeng.com.au.

Disclaimer to Recruitment Agencies:

Please be advised that GPA Engineering does not accept resumes submitted by third-party recruitment agencies. All job applications must be submitted directly by the candidate through our official career portal or via direct contact with our HR team. We will not be held liable for any fees or claims from recruitment agencies regarding unsolicited resumes or candidate submissions. We appreciate your understanding and cooperation.