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Senior Network Security Engineer

X4 Technology
Greater London
1 week ago
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Senior Network Security Engineer

Contract £375 - 400 per day + Outside IR35

Senior Network Security Engineer – 3-Month Initial Contract (Extension likely)


Location: Onsite in West Drayton/Hayes, UK (5 Days per Week)


Start: ASAP


IR35: Outside IR35


Security Clearance: Will be sponsored for eligible candidates

We’re not looking for just another engineer – we’re after a seasoned Network Security expert who’s ready to step into a key role on a high-impact project with critical infrastructure at its core. If you thrive in a fast-moving, hands-on environment and want to work with cutting-edge tech, this contract is built for you.

Senior Network Security Engineer The Tech Stack You’ll Own:

Fortinet SD-WAN – Core to the network transformation


Fortinet Firewalls – Design and deployment
Cisco Nexus – High-performance switching environments
Cisco Wi-Fi / LAN
Routing & Switching – Solid fundamentals essential
Firewall & Security Architecture – Design, configure, secure
Configuration Mastery – You’ll write and load full network configs

What Makes This Role Different?

Security Clearance provided – We’ll sponsor you if eligible.


Outside IR35 – Work with freedom and flexibility.
Real Possibility of Extension – This is just phase one of a wider programme.
Onsite, In-Person Delivery – Be at the heart of the action, not a face on a screen.
High-Impact Work – You’ll help shape critical infrastructure from day one.

✅ You Should Apply If:

You’re a senior-level network security engineer with a track record in hands-on delivery.


You’re confident with Fortinet and Cisco environments, and can hit the ground running.
You can design, build, and troubleshoot secure networks without breaking a sweat.
You’re eligible for UK Security Clearance (we’ll help you get it).
You want more than just another contract – you want to be part of something that grows.

Interested?


Send your CV to us today for an immediate call back. Interviews are taking place now, and the start date is as soon as you’re ready.

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