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SR2 | Socially Responsible Recruitment | Certified B Corporation™

Network Security Engineer

On site

London, United kingdom

Freelance

09-10-2025

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Skills

Network Security Penetration Testing Security Testing Networking Architecture Network Architecture api testing

Job Specifications

Network Security Engineer

Network Security / Penetration Testing / CREST / CSTL / API Testing / Config Reviews / Infrastructure / Outside IR35 / West London

We're seeking an experienced Network Security Engineer to support a major multi-phase security testing project. You'll conduct penetration tests, configuration reviews, and infrastructure assessments, contributing to a high-profile programme of work extending into next year.

Required

Strong background in network and infrastructure security.
Experience performing penetration testing, configuration reviews, and API testing.
Knowledge of "classic" CHECK-style testing methodologies.
CREST, CSTL or CTL certification (Team Member or Team Leader level).
Ability to deliver high-quality reports and communicate technical findings clearly.
Hands-on experience across infrastructure, networking, and external testing.
Desirable

Experience working within CHECK or other accredited testing schemes.
Strong understanding of secure network architecture and hardening practices.
Previous consultancy or project-based testing experience.
Contract Details

Outside IR35
West London (on-site presence required for majority of testing)
0-hours contract - project-based work, phase by phase
Initial phase focused on network testing, with further phases planned into next year
Day Rate: Competitive
Start: ASAP
1-Stage Interview Process with consultancy SME

Please apply now or contact me directly if this role looks like a good fit. From there I'll be in touch to discuss the opportunity in more detail.

Network Security / Penetration Testing / CREST / CSTL / CTL / API Testing / Config Reviews / Infrastructure / Outside IR35 / West London

About the Company

Built to Make an Impact. We exist to harness the power of recruitment to create meaningful change across the world. Our mission is simple but profound: to connect purpose-driven talent with industries that shape a better future. From driving innovation in Tech for Impact, advancing the global Clean Energy transition, to empowering Central Government Public Services, we are a Global Recruitment Group committed to making an impact and leaving a positive legacy. Why We Exist We believe recruitment should do more than fil... Know more