Network Administrator – Adelaide

GPA Engineering; Adelaide; On-site; AUD 90,000 - 120,000; Full time

Benefits offered by this job

Competitive Salary & Rewards

Career Growth & Development

Flexibility

Health & Wellbeing

Family-Friendly Benefits

Community & Culture

Giving Back

Diversity & Inclusion

Job summary

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

Key Duties include firewall administration, SD-WAN tuning, switching, wireless, and core services such as DNS/DHCP. Strong troubleshooting and documentation skills are essential, with certifications welcomed.

Qualifications

• 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.

Responsibilities

• 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

Enterprise network administration

Palo Alto firewalls & Panorama

SD-WAN & WAN optimization

DNS/DHCP/VLANs/TCP/IP

Network security principles

Wireless networking security

Troubleshooting & documentation

Certifications (PCNSA/PCNSE)

Microsoft server & identity infra

Cloud-based network management

Tools

Palo Alto Panorama

DNS/DHCP servers

VPN technologies

Enterprise wireless controllers

Job description

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 cultu re of a close-knit team.

Job Description

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.

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.

Desired Skills and Experience

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.
• 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.