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Network Security Engineer
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
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
Tools
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.
- 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.
- 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.
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
* The salary benchmark is based on the target salaries of market leaders in their relevant sectors. It is intended to serve as a guide to help Premium Members assess open positions and to help in salary negotiations. The salary benchmark is not provided directly by the company, which could be significantly higher or lower.