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The ONE Group Ltd
Network Security EngineerThe ONE Group Ltd • Stevenage, England, GB
Network Security Engineer

Network Security Engineer

The ONE Group Ltd • Stevenage, England, GB
30+ days ago
Job type
  • Full-time
Job description

Be among the first 25 applicants

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.

Base pay range

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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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Network Security Engineer • Stevenage, England, GB

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