_{18th September, 2026}

Firewall Engineer 
6 Months (High chance of extensions)
Sydney OR Melbourne
$1,000 p/d 

About the opportunity:

Our client is undertaking a major overhaul of their network security estate, moving off Juniper SRX and onto Fortinet FortiGate across a large and complex environment. This is a hands on, delivery focused engagement for someone who's done this exact kind of migration before and can own it end to end, from design through cutover to hypercare, while working inside a tightly controlled, high availability production environment.

What you'll be doing:

• Leading the technical design and delivery of the SRX to FortiGate migration across core, edge and branch sites, including HA pairs and segmented zones
• Converting and improving existing Juniper policies, NAT rules, VPNs and routing configs into clean, optimised FortiGate equivalents
• Cleaning up the rule base as you go, removing shadowed, unused or overly permissive rules
• Redesigning and testing site to site and remote access VPNs (IPsec and SSL) with minimal disruption to users
• Writing detailed cutover runbooks, rollback plans and validation test cases for every migration window
• Coordinating cutovers with network, application and business teams in a formal change managed setting
• Standing up FortiManager and FortiAnalyzer for centralised policy control, logging and reporting
• Working with SOC, SIEM and vulnerability management teams to keep detection and alerting coverage intact through the transition
• Integrating with existing routing, SD WAN, load balancing and identity systems (RADIUS, LDAP, SAML)
• Keeping HLDs, LLDs and as built documentation accurate and current
• Presenting risk and impact assessments through formal change approval processes
• Providing hypercare and knowledge transfer to the BAU network security team post go live

What we need to see:

• 5+ years in network security engineering, with genuine hands on depth in both Juniper SRX and Fortinet FortiGate
• A completed large scale firewall vendor migration under your belt, ideally in a highly regulated or compliance heavy environment
• Strong grounding in firewall policy design, NAT, routing (BGP/OSPF), VPN technologies and network segmentation
• FortiManager and FortiAnalyzer experience for centralised management and logging
• Comfortable across both Junos and FortiOS, CLI and GUI
• Solid understanding of operating within strict regulatory and compliance frameworks
• Experience working inside formal ITIL aligned change and CAB processes
• Strong L2 to L7 troubleshooting ability
• Clear written and verbal communication, including explaining technical risk to non technical stakeholders

Bonus points:

• Fortinet NSE 4 to 7 (NSE 7 highly regarded)
• Juniper JNCIA or JNCIS SEC
• CCNP Security, CISSP or similar
• ITIL Foundation
• Prior migration work inside a bank, insurer or other tightly regulated organisation
• Experience delivering zero downtime or low impact migrations across active/active HA environments
• Exposure to cloud adjacent firewalling (Azure/AWS) in hybrid setups
• A genuinely rigorous approach to testing, given how much is riding on getting every rule right

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