Network Security Engineer SOC

The One Group; Stevenage; On-site; GBP 50,000; Part time

Job summary

A cybersecurity firm in Stevenage is seeking a Network Security Engineer for a part-time role. The candidate will monitor security events and manage firewalls in a 24/7 SOC environment. Key qualifications include a strong understanding of networking and hands-on experience with firewall technologies. Benefits include a company bonus scheme and pension contributions. This position requires SC eligibility 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

Excellent on-site facilities

Qualifications

• Strong knowledge of TCP/IP, DNS, routing, switching, VLANs.
• Hands-on experience with advanced features like IPS/IDS.
• Knowledge of IPSec, SSL/TLS, VPNs.

Responsibilities

• Monitor and investigate security events in a SOC environment.
• Configure, maintain, and troubleshoot enterprise firewalls.
• Conduct deep-dive analysis to identify malicious traffic.

Skills

Understanding of core networking

Next-generation firewall technologies

Network monitoring tools

Analyzing complex traffic flows

Secure network architectures

Exposure to SIEM platforms

Tools

Cisco

Palo Alto

Checkpoint

Splunk

LogRhythm

Darktrace

Job description

Network Security Engineer (SOC)

Location: Stevenage
Salary: Circa GBP50,000 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