Contract Network Security Lead — On-Prem & F5 Expert

La Fosse Associates; Greater London; On-site; GBP 129,000 - 138,000; Full time

Job summary

La Fosse Associates is seeking a Contract Network Security Lead for a Global Financial Services Organisation in London. You will oversee the refresh of network security architecture across a predominantly on-prem estate, providing senior technical direction.

The role focuses on WAF, F5, firewalls, VPNs, network segmentation, and legacy infrastructure, acting as a strategic consultant rather than hands-on engineering.

Qualifications

• Deep expertise in network security architecture and risk management.
• Experience with on-prem network environments in regulated industries.
• Ability to translate security architecture into practical, measurable improvements.

Responsibilities

• Lead the refresh of the network security architecture and roadmap across a predominantly on-prem environment.
• Provide senior technical direction across WAF, segmentation, firewall architecture and rule sets, VPN connectivity.
• Drive uplift of F5 environments with exposure to Palo Alto and Blue Coat considered desirable.
• Own the refresh of network security controls and track progress against security metrics.

Skills

WAF

F5

Firewalls

Network segmentation

VPNs

Tools

Palo Alto

Blue Coat

Job description

La Fosse Associates is seeking a Contract Network Security Lead for a Global Financial Services Organisation in London. You will oversee the refresh of network security architecture across a predominantly on-prem estate, providing senior technical direction.

The role focuses on WAF, F5, firewalls, VPNs, network segmentation, and legacy infrastructure, acting as a strategic consultant rather than hands-on engineering.