Network Security Engineer (SOC)
Location: Stevenage
Salary: Circa £50,000 per annum
Contract: Part-time | SC Eligible (British Citizenship Required)
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
Benefits:
* 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