Network Security Engineer

🔒 Confidential Employer
Posted 24 March 2026
LOCATION
London
TYPE
Contract
LEVEL
Mid-Senior level
CATEGORY
Technology
This employer holds a UK Home Office sponsor license — sponsorship for this specific role is at the employer’s discretion

SKILLS

Firewalls Network Security Fortigate Check Point Palo Alto ITSM Routing & Switching

FULL DESCRIPTION

Network Security Engineer

This is an exciting opportunity to join an elite Operations team focusing on BAU operational support with a strong emphasis on network security technologies, particularly firewalls. This is an initial 6 month contract opportunity Inside IR35 with the prospect of extension. You will be required to be on site 3 days a week, based in Central London.

What you'll be doing:

  • Working with multiple internal customers to deliver projects.
  • Delivering on large and interesting projects spread across firewalls, proxy, web security & load balancers
  • Manage and resolve tickets from the ITSM system, ensuring timely updates and completion in line with SLAs.
  • Implement and maintain firewall rules across Fortigate, Check Point, and Palo Alto firewalls.
  • Perform firewall software upgrades, configuration backups, and post-upgrade validation.
  • Work as part of the Network Operations Team to deliver BAU support and operational excellence, 1 week in 4 working on tier 3 tickets.
  • Support network security policy enforcement and ensure compliance with security standards.
  • Collaborate with other teams to troubleshoot connectivity or access issues related to firewall configurations or security controls.
  • Maintain accurate configuration and change documentation for all managed devices.

What you'll bring:

  • Strong hands-on experience with enterprise firewalls — particularly Fortigate, Check Point, and Palo Alto.
  • Experience with L7 traffic inspection
  • Experience with Web Proxies ( any vendor )
  • Good understanding of network security principles and firewall rule management.
  • Experience working within an ITSM ticketing environment, handling incidents and service requests through to resolution.
  • Familiarity with TACACS and Cisco ISE for authentication and access control.
  • Good Routing & Switching knowledge (Layer 2/3 fundamentals, VLANs, routing protocols, etc.).
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