X4 Technology
SC Cleared Network Security Engineer
United Kingdom
£350/day
Posted about 21 hours ago
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Job Title: SC Cleared Network Security Engineer
Day Rate: £350/day (OUTSIDE IR35)
Location: Fully Remote
Contract Length: 6 Months
Role & Responsibilities
- Provide technical ownership of the customer's enterprise security infrastructure, ensuring the stability, performance, and lifecycle management of critical security platforms.
- Act as the senior technical authority for all firewall, network security, and secure access changes, delivering design, implementation, and ongoing optimisation across complex enterprise environments.
- Produce and maintain High Level Designs (HLDs), Low Level Designs (LLDs), technical documentation, and operational procedures for security solutions and network infrastructure.
- Lead the investigation and resolution of complex security incidents, acting as the technical escalation point and coordinating with vendors to restore service and minimise business impact.
- Support the delivery of data center network projects by providing technical assurance, change management, hardware/software lifecycle planning, and infrastructure best practice.
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Required Experience
- Proven hands-on experience designing, implementing, and supporting enterprise security solutions using Palo Alto, Zscaler, and F5 technologies.
- Strong understanding of firewall technologies, VPN solutions (IPSec, SSL VPN, DMVPN), secure remote access, and network security best practices within large enterprise environments.
- Experience producing High Level and Low Level Designs (HLDs/LLDs), technical documentation, and supporting complex infrastructure change and lifecycle management.
- Solid networking knowledge including TCP/IP, routing, switching, and WAN technologies, with the ability to troubleshoot across security and network infrastructure.
- Desirable experience with Check Point, Juniper, Blue Coat, Cisco networking (Catalyst/Nexus), Wireless, Cisco ISE/802.1X, QoS, and Infoblox DNS.
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Interviews: August 2026
Start Date: September 2026
How to Apply
Apply to Gary Hargreaves at X4 Technology to learn more about the role or connect with me on LinkedIn to hear about regular job updates available with X4 Technology.
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Skills
Palo Alto
Zscaler
F5
Firewall Design
VPN Solutions
HLD/LLD Documentation
TCP/IP
Routing
Switching
WAN Technologies
Network Security
Infrastructure Lifecycle Management
Incident Resolution
Cisco Networking
Cisco ISE
Infoblox DNS
Location