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Comgent

Lead Network Security Engineer/ Architect- freelance - hybrid, London, UK

Comgent Greater London, England, United Kingdom

IT Services and IT Consulting · 11-50 employees

Apr 21
security Senior (5-10 yrs) Contractor United Kingdom
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About the role

The role involves engineering and operating firewall, proxy, and load balancing platforms while designing secure network segmentation strategies. You will also be responsible for delivering technical documentation, managing vendor relationships, and driving automation across security workflows.

What they look for

Palo Alto FortiGate F5 BIG-IP Cisco ACI Network Security Zero Trust Firewall Management Proxy SWG TLS Inspection Incident Response Automation Python Ansible Infrastructure as Code Compliance

Requirements

Candidates must have hands-on expertise with Palo Alto, FortiGate, and F5 platforms alongside strong L2-L7 troubleshooting skills. Experience in regulated environments, specifically financial services, and proficiency in Cisco ACI security design are required.

Full description

We are committed to building an inclusive workplace and encourage applications from all qualified candidates.

Reports to Head of Data Centre and Network Services. Responsibilities: 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 L2–L7 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

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