Senior Network Security Engineer (L4) – Onsite, London

N Consulting Limited; Guildford; On-site; GBP 65,000 - 69,000; Full time

Job summary

A leading technology firm is seeking a Senior Network Security Engineer (L4) based in Guildford, UK, to manage and troubleshoot enterprise security solutions. The ideal candidate will have over 6–10 years of experience with a strong proficiency in Cisco security technologies including ASA, ISE, and Check Point firewalls. Responsibilities include implementing security architecture, troubleshooting network issues, and ensuring compliance with industry standards. This full-time role offers a salary between £65,000 - £69,000 annually.

Qualifications

• 6–10+ years of strong experience in enterprise Network Security.
• Experience in large, distributed, high-availability environments.
• Proven track record of leading install, upgrade, migration, and decommission projects.

Responsibilities

• Manage, configure, and troubleshoot Cisco ISE, ASA/FTD, and Check Point firewalls.
• Lead hardware refresh, firewall replacement, and migration projects.
• Participate in designing secure network architectures.

Skills

Cisco ISE (expert level)

Cisco ASA/FTD

Check Point R80.x

F5 APM

Cisco Switching/Routing in DC environment

Packet capture tools: Wireshark, tcpdump

Cloud networking (AWS/Azure)

Automation/Scripting knowledge (Python, Ansible)

Job description

A leading technology firm is seeking a Senior Network Security Engineer (L4) based in Guildford, UK, to manage and troubleshoot enterprise security solutions. The ideal candidate will have over 6–10 years of experience with a strong proficiency in Cisco security technologies including ASA, ISE, and Check Point firewalls. Responsibilities include implementing security architecture, troubleshooting network issues, and ensuring compliance with industry standards. This full-time role offers a salary between £65,000 - £69,000 annually.