Lead Network Security Engineer Architect- freelance hybrid, London, UK
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Job Summary
Reports to Head of Data Centre and Network Services.
- Engineer and operate firewall platforms (Palo Alto FortiGate) F5 BIG-IP IPS and proxy/SWG solutions including rule lifecycle management policy optimisation and senior incident response
- Design and enforce macro/micro-segmentation strategies across Cisco ACI firewall-based and hybrid fabric models
- Architect secure proxy TLS inspection and Zero Trust connectivity patterns for on-prem cloud and hybrid traffic flows
- Deliver HLDs LLDs runbooks and design standards; provide technical sign-off and risk assessments for major programmes
- Support compliance and audit with traceable governance-aligned documentation
- Engage vendors (Palo Alto Fortinet F5) and stakeholders across Infrastructure Cyber Security and Risk
- Drive automation and improvement across rule management ACI workflows and compliance validation
Requirements
Hands-on expertise with Palo Alto FortiGate F5 BIG-IP and proxy/SWG platforms
Strong L2L7 troubleshooting and incident leadership
Cisco ACI security and policy design experience
Regulated environment experience (e.g. financial services) with strong audit documentation skills
Preferred: Cloud security (Azure/AWS) SASE/Zero Trust transformation automation via Python Ansible or IaC
Required Skills:
Palo Alto PAN-OS FortiGate/FortiOS F5 BIG-IP Cisco ACI/APIC IDS/IPS Proxy/SWG TLS inspection micro-segmentation Zero Trust SASE Azure/AWS network security ExpressRoute/Direct Connect Python Ansible IaC
Required Education:
Palo Alto PAN-OS FortiGate/FortiOS F5 BIG-IP Cisco ACI/APIC IDS/IPS Proxy/SWG TLS inspection micro-segmentation Zero Trust SASE Azure/AWS network security ExpressRoute/Direct Connect Python Ansible IaC
