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# Senior Network Security Engineer

- **Company:** Clerkenwell
- **Location:** London, UK
- **Experience:** Expert
- **Salary:** £80,000.0
- **Contract:** Permanent contract
- **Skills:** Bash Shell, Border Gateway Protocol, Complex Networks, Linux, VMware ESX Servers, Intrusion Detection Systems, Python (Programming Language), Kernel-Based Virtual Machine, Network Security, NetFlow, Routing, Packet Analyzer, Security Information and Event Management, TCP/IP, Tcpdump, Wireshark, Virtualization Technology, In-Plane Switching (IPS), Cyber Threat Analysis, Firewalls (Computer Science), Information Technology, Ddos, Splunk
- **Published:** September 9, 2026
- **Apply:** https://www.apply4u.co.uk/jobs/senior-network-security-engineer/46487578

## About the Role

expertise are part of the job, not an extra. What we are looking for: 24 years' experience in networking, cybersecurity, or infrastructure Degree in Computer Science or a related field Strong networking fundamentals TCP/IP, routing, Layer 13 troubleshooting Proven experience in incident response and customer-facing technical roles The temperament to own and resolve incidents under real pressure Excellent communication skills clear, calm, customer-ready Scripting and automation ability (Python, Bash, or similar) Nice to have BGP, FlowSpec, and traffic engineering knowledge NetFlow / sFlow analysis IDS/IPS, firewalls, and packet analysis (Wireshark, tcpdump) SIEM experience (Splunk) Linux proficiency Virtualisation (KVM, ESXi) Certifications such as CCNP, JNCIS/JNCIP, CySA+, GIAC GCIA or GCIH Bright Purple is an equal opportunities employer: we are proud to work with clients who share our values of diversity and inclusion in our industry. TPBN1_UKTJ

## Description

Senior Network Security Engineer Scotland/Hybrid Schedule: Rotating shift (includes nights/weekends) Salary up to £80,000 You will own incidents end-to-end across Incident, Major Incident, Change, Problem, and Service Request workflows (ITIL-aligned), leading real-time response to live DDoS attacks and complex network events as they unfold. Day to day, that means performing advanced 1st3rd line triage and troubleshooting across the platform and customer environments, acting as a subject matter expert on our real-time mitigation technology, and serving as the technical escalation point for junior engineers. You will work directly with customers and partners during high-impact incidents, collaborate closely with Engineering, Product, and Threat Intelligence to feed insight back into the platform, and drive the documentation, runbooks, and operational improvements that raise the bar for the whole team. Mentoring junior engineers and continuously deepening your own networking and DDoS


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