Infrastructure Penetration Tester | CHECK | Crest | CSTL/CTL | Networking | Config Reviews | API Testing | Contract
Pen Testing | Infrastructure | External & Internal Networks
SR2 is partnered with a leading security consultancy on a significant multi-phase testing programme, and we're looking for an experienced Infrastructure Penetration Tester to join the team.
This role will focus on delivering hands‑on penetration testing across external and internal networks, reviewing system configurations, and identifying vulnerabilities within critical infrastructure. You'll work alongside a small team of experienced testers to support a major client undergoing large-scale change, ensuring their environment is secure and compliant.
Key Responsibilities:
* Conduct comprehensive external and internal infrastructure penetration tests, starting with perimeter systems and moving into internal networks
* Perform configuration reviews across Servers, Firewalls, Routers, and network devices
* Execute API security testing to assess authentication, data access, and integration risks
* Deliver "old‑school" CHECK‑style network and infrastructure testing in line with industry standards
* Produce detailed technical reports outlining vulnerabilities, exploitation paths, and remediation guidance
* Collaborate with the project lead and wider team across a six‑phase testing programme
* Engage directly with stakeholders and SMEs to ensure smooth onboarding and delivery
Skills & Experience Required:
* Proven background in infrastructure penetration testing within complex network environments
* Crest certification or CHECK Team Member/CHECK Team Lead (CTM/CTL) status advantageous
* Strong understanding of networking, configuration management, and common attack vectors
* Experience performing API and configuration reviews
* Excellent report writing and communication skills for both technical and non‑technical audiences
* Ability to work on‑site in London for key phases of testing
* Collaborative mindset, comfortable working as part of a small testing team (3-4 people)
The Details:
* Contract role - IR35 Outside
* Rate: market rate
* Location: West London
* Start: Within 2-3 weeks
* Length: 6 months
If you're am Infrastructure penetration tester with experience across networks, configurations, and APIs, and you're looking for a hands‑on role in a collaborative team delivering a major London‑based project, apply now for immediate consideration.
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