Network Security Engineer in Stevenage

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This range is provided by The ONE Group Ltd. Your actual pay will be based on your skills and experience — talk with your recruiter to learn more.

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Working Pattern: 24/7 shift rota on-site & on-call

We\’re looking for a Network Security Engineer to join a high-performance security operations environment, protecting critical infrastructure and ensuring the resilience of complex enterprise networks. You\’ll work within a 24/7 Incident Response function, combining hands‐on engineering with real‐time threat detection, investigation, and remediation.

Key Responsibilities:

Monitor, investigate and triage security events within a 24/7 SOC environment

Configure, maintain and troubleshoot enterprise firewalls (Cisco, Palo Alto, Checkpoint)

Manage secure proxy platforms such as Bluecoat or F5, including content filtering and SSL inspection

Lead deep-dive analysis using packet capture to identify malicious traffic and attacker behaviours

Implement secure changes across network architecture, ensuring compliance and best practices

Support continuous improvement through the optimisation of network security tools, including \”purple team\” feedback and hardening recommendations

Contribute to the standardisation of network security tooling and documentation

Collaborate with infrastructure, security and architecture teams to deliver robust, resilient network solutions

About You:

Strong understanding of core networking: TCP/IP, DNS, routing, switching, VLANs, load balancing

Hands‐on experience with next‐generation firewall technologies and advanced features (IPS/IDS, SSL decryption, DPI)

In‐depth knowledge of IPSec, SSL/TLS, VPNs and authentication mechanisms

Experience with network monitoring tools (PRTG, Nagios or similar)

Ability to analyse complex traffic flows and identify threat patterns such as exploitation, C2, lateral movement, or exfiltration

Understanding of secure network architectures (DMZs, segmentation, internal zones)

Exposure to SIEM platforms (Splunk, LogRhythm, Darktrace) is beneficial

Experience interpreting OSI model behaviours and protocol‐level diagnostics is advantageous

SC eligible with British citizenship

Company bonus scheme

Pension contributions up to 14%

Paid overtime opportunities

Flexi‐leave (up to 15 additional days)

Enhanced parental leave

Subsidised meals, free parking and excellent on‐site facilities

Seniority level

Mid‐Senior level

Employment type

Part‐time

Job function

Information Technology, Production, and Analyst

Industries

Aviation and Aerospace Component Manufacturing

Defense and Space Manufacturing

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