Senior Network Security Engineer (L4) – Cisco/Check Point/F5

Falconsmartit; Guildford; On-site; GBP 67,000 - 89,000; Part time

Job summary

Falconsmartit seeks a Senior Network Security Engineer (L4) to design, implement and optimize enterprise security across multi-site data centers in Guildford or Bournemouth. You will lead installations, upgrades, migrations and decommissioning with strong troubleshooting and cross-team collaboration.

The role requires hands-on experience with Cisco ISE, ASA/FTD, Check Point, and F5 APM, plus governance and incident response.

Qualifications

• 6–10+ years of enterprise network security experience.
• Experience in large, distributed, high-availability environments.
• Proven track record of leading install, upgrade, migration, and decommission projects.
• Experience handling major incidents and RCA documentation.
• Strong collaboration and clear communication across teams.

Responsibilities

• Security infrastructure operations & engineering across multi-site data centers.
• Implementation, installation & decommissioning of security devices (ASA/FTD, Check Point, ISE, F5 APM).
• Project and architecture support with design of secure networks and SOPs.
• Security operations & troubleshooting; RCA, long-term fixes, and cross-team coordination.
• Governance, compliance with ISO 27001/NIST/PCI-DSS and ongoing policy optimization.

Skills

Security architecture

Troubleshooting

Collaboration

Documentation

Leadership

Tools

Cisco ISE

ASA/FTD

Check Point R80.x

F5 APM

Nexus switches

Wireshark

tcpdump

Python

Ansible

Job description

Falconsmartit seeks a Senior Network Security Engineer (L4) to design, implement and optimize enterprise security across multi-site data centers in Guildford or Bournemouth. You will lead installations, upgrades, migrations and decommissioning with strong troubleshooting and cross-team collaboration.

The role requires hands-on experience with Cisco ISE, ASA/FTD, Check Point, and F5 APM, plus governance and incident response.