Level 3 Network Engineer, Sydney

Position Overview
We are seeking an experienced Level 3 Network Engineer to provide advanced network support across a critical Operational Technology (OT) environment. The role focuses on enterprise networking, network security, load balancing, proxy services, and network time synchronisation.
The successful candidate will work closely with IT, OT, engineering, cybersecurity, and operational teams to maintain secure, reliable, and highly available network services.

Key Responsibilities

• Provide Level 3 support for complex network incidents, problems, and outages.
• Configure, maintain, and troubleshoot Dell PowerSwitch network infrastructure.
• Administer and troubleshoot Palo Alto Firewalls, including policies, NAT, VPNs, and routing.
• Support F5 Load Balancers, including virtual servers, pools, health monitors, and SSL/TLS.
• Support and troubleshoot Squid Proxy services and configurations.
• Maintain and troubleshoot Trimble GPS Clock and network time synchronisation services.
• Troubleshoot TCP/IP, DNS, DHCP, VLANs, routing, switching, VPNs, and network connectivity.
• Perform root-cause analysis and implement permanent solutions.
• Support network security, segmentation, hardening, and vulnerability remediation.
• Perform network installations, upgrades, maintenance, and technology refresh activities.
• Maintain network documentation, diagrams, configurations, and operational procedures.
• Work with vendors and internal teams to resolve complex technical issues.

Essential Skills & Experience

• 5+ years' experience in network engineering or a similar technical role.
• Proven Level 3 network troubleshooting and support experience.
• Strong hands-on experience with Dell PowerSwitch or equivalent.
• Strong experience with Palo Alto Firewalls.
• Experience with F5 Load Balancers.
• Experience with Squid Proxy or equivalent proxy technologies.
• Experience with Trimble GPS Clock, NTP, PTP, or network time synchronisation.
• Strong knowledge of TCP/IP, VLANs, routing, DNS, DHCP, VPNs, NAT, and network security.
• Experience with network monitoring and diagnostic tools such as Wireshark and tcpdump.
• Strong problem-solving and root-cause analysis skills.
• Ability to work independently and support critical operational environments.
• Experience in OT, utilities, energy, mining, manufacturing, or other critical infrastructure is highly desirable.