Network Security Engineer

Cyber Security training courses; Stevenage; Hybrid; GBP 50,000 - 60,000; Full time

Job summary

A leading technology security firm in the United Kingdom is looking for a Senior Network Security Engineer to safeguard critical systems and network infrastructures. The role includes building and optimizing advanced network security solutions, responding to security incidents, and ensuring compliance across the network estate. Ideal candidates will possess strong networking knowledge, real-world experience with security tools, and exceptional analytical skills. This position offers a competitive salary between £50,000 and £60,000 per annum, a shift allowance, and bonus opportunities.

Benefits

Shift allowance

Bonus opportunities

Comprehensive benefits

Qualifications

• Solid networking principles: TCP/IP, DNS, VLANs, Switching, Load Balancing.
• Real-world experience with firewalls, proxies, SSL inspection, IPS/IDS, VPNs.
• Strong analytical skills – able to interpret packet captures, root cause analysis.

Responsibilities

• Build and optimise network security solutions.
• Triage and respond to SOC alerts.
• Identify vulnerabilities and drive improvements.

Skills

Networking principles: TCP/IP, DNS, VLANs

Experience with firewalls, proxies

Strong analytical skills

Familiarity with Darktrace, Splunk

Tools

Cisco

Checkpoint

Palo Alto

F5

Job description

Join a unique, multi-national Information Management function that partners with governments and the Armed Forces to defend freedom and national sovereignty. As a Network Security Engineer, you'll play a vital role in safeguarding critical systems and network infrastructures as part of a 24x7 Internal Security Response team.

You'll play a critical role as part of a 24x7 Internal Security Response team, helping safeguard our organisation's network infrastructure and respond to security incidents. When you're not collaborating with SOC experts, you'll design and maintain robust security solutions, protecting us against ever-evolving threats.

What you'll do:

• Build and optimise network security solutions (think next-gen firewalls, proxies, monitoring tools).
• Work hands-on with Cisco, Checkpoint, Palo Alto, Bluecoat, F5 and more.
• Triage and respond to SOC alerts, collaborating closely with our analysts.
• Identify vulnerabilities and drive improvements based on Purple Team testing.
• Champion best practice and compliance across our network estate.

We're looking for:

• Solid networking principles: TCP/IP, DNS, VLANs, Switching, Load Balancing.
• Real-world experience with firewalls, proxies, SSL inspection, IPS/IDS, VPNs.
• Strong analytical skills – able to interpret packet captures, root cause analysis, and more.
• Familiarity with tools like Darktrace Antigena, Splunk ES, Log Rhythm is a plus.

About the job

Contract Type: Permanent

Specialism: Technology & Digital

Focus: Information Security

Industry: IT

Salary: £50,000 - £60,000 per annum + £8k shift allowance + Bonus + Bens

Workplace Type: Hybrid

Experience Level: Senior Management

Location: Stevenage

Date posted: 10 December 2025