Senior Cybersecurity Tester/Researcher
We are seeking a Senior Cybersecurity Tester/Researcher to lead advanced security assessments, identify emerging threats, and strengthen the resilience of complex technology environments. In this role, you will plan and execute penetration tests, red team exercises, vulnerability assessments, and adversary simulations across networks, applications, cloud platforms, APIs, endpoints, and infrastructure. You will assess security controls, investigate weaknesses, validate exploitability, and clearly communicate technical findings to both specialist and non-specialist audiences.
Key responsibilities include developing testing methodologies and rules of engagement, conducting manual and automated security testing, researching new attack techniques, and creating proof-of-concept exploits where appropriate. You will analyse attack paths, document evidence, rate risks, and provide practical remediation guidance. The role will also involve maintaining and improving testing tools, scripts, and laboratory environments; contributing to threat intelligence activities; supporting incident investigations; and collaborating with engineering, architecture, and risk teams to embed security throughout the development and operational lifecycle. You may also mentor junior testers and contribute to security standards, procedures, and knowledge-sharing initiatives.
The successful candidate will have substantial experience in penetration testing, offensive security, vulnerability research, or a closely related discipline, together with strong knowledge of network, web application, cloud, operating system, and identity security. Proficiency with scripting or programming languages such as Python, PowerShell, Bash, or JavaScript is expected, along with practical experience using industry-standard security testing and analysis tools. Relevant professional certifications are desirable, such as OSCP, CREST, GXPN, OSEP, or equivalent qualifications. You should demonstrate sound judgement, curiosity, attention to detail, and the ability to work independently on sensitive assignments. Strong written and verbal communication skills are essential, as is a commitment to ethical testing, responsible disclosure, confidentiality, and continuous professional development.
Senior Cybersecurity Tester/Researcher
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