Principal Penetration Tester (12 Month FTC)
We are seeking an experienced Principal Penetration Tester for a 12-month fixed-term contract. This is a senior technical role responsible for planning and delivering high-quality penetration testing and security assessment engagements across applications, infrastructure, cloud environments, networks, APIs, mobile platforms and emerging technologies. You will work with technical and business stakeholders to understand risk, define appropriate testing approaches and provide practical, evidence-based recommendations that strengthen security resilience.
Your responsibilities will include leading complex penetration tests from scoping and threat modelling through to exploitation, reporting and remediation support. You will identify and validate vulnerabilities, assess their potential business impact, and produce clear reports suitable for both technical and executive audiences. You will also provide mentoring and technical guidance to other testers, contribute to the development of testing methodologies and tooling, support quality assurance activities, and help improve the wider security assessment service. Where appropriate, you may represent the testing function in security reviews, risk discussions and remediation planning sessions.
Applicants should have substantial professional experience in penetration testing, red teaming or an equivalent offensive security role, together with a strong understanding of common attack techniques, security controls and vulnerability management. Demonstrable expertise in areas such as web application, API, network, cloud or Active Directory testing is required, along with the ability to script or automate tasks using languages such as Python, PowerShell or Bash. Industry-recognised certifications such as OSCP, CREST, GXPN, GPEN or equivalent are desirable. You will need excellent written and verbal communication skills, strong report-writing ability, sound judgement and a methodical approach to managing multiple engagements. The successful candidate must be comfortable working independently, handling sensitive information responsibly and collaborating effectively with colleagues and stakeholders at all levels.
Principal Penetration Tester (12 Month FTC)
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