We tackle the most complex problems in quantitative finance, by bringing scientific clarity to financial complexity. From our London HQ, we unite world-class researchers and engineers in an environment that values deep exploration and methodical execution - because the best ideas take time to evolve. Together we’re building a world-class platform to amplify our teams’ most powerful ideas. Security is foundational to this mission and must be delivered in a way that supports how our engineering teams build and operate complex systems at scale. Take the next step in your career. The role As a Penetration Tester, you will lead and conduct penetration tests and vulnerability assessments across a wide range of internal systems and security controls. Your work will directly strengthen our overall security posture through continuous testing, actionable insights and collaboration on remediation strategies. Key responsibilities of the role include: Performing in-depth penetration testing across a variety of technologies, including Kubernetes, Jenkins and Windows Domain Services Delivering practical, impactful remediation advice to Control Owners based on identified vulnerabilities Supporting business and application owners in assessing and improving the effectiveness of their security controls Providing technical consulting and assurance to Risk, Compliance and Detection Engineering teams, including control assessments and configuration reviews Maintaining and enhancing the team’s operational tooling, automation and system integrations Mentoring and supporting less experienced team members, fostering knowledge sharing and growth Who are we looking for? The ideal candidate will have the following skills and experience: Proven expertise across the full penetration testing lifecycle, from scoping and execution to reporting and stakeholder debriefs Deep understanding of vulnerability assessment practices, including effective remediation strategies for both infrastructure and application-level security Strong background in technical security roles across diverse environments; familiarity with DevOps technologies Experience validating the effectiveness of security controls through both manual and automated approaches Engineering experience, particularly in building automation and tooling to streamline team output Proficiency in development and scripting tools commonly used in DevSecOps, including Python, Jenkins and Ansible. Relevant security certifications with OSCP required and CRT or OSEP desirable Strong communication and interpersonal skills, with an emphasis on clear and concise written output Why join us? Highly competitive compensation plus annual discretionary bonus Lunch provided via Just Eat for Business and dedicated barista bar 30 days’ annual leave 9% company pension contributions Informal dress code and excellent work-life balance Comprehensive healthcare and life assurance Cycle-to-work scheme Monthly company events G-Research is committed to cultivating and preserving an inclusive work environment. We are an ideas-driven business and we place great value on diversity of experience and opinions. We want to ensure that applicants receive a recruitment experience that enables them to perform at their best. If you have a disability or special need that requires accommodation please let us know in the relevant section At G-Research, we are passionate about the intersection of finance, technology, and the future. We offer a dynamic, flexible and highly stimulating culture where world-beating ideas are cultivated and rewarded. We are proud to employ some of the best people in their field and to nurture their talent in our collaborative working environment.

Penetration Tester.

more at G.

Performance Engineering Manager

Machine Learning Engineer

Database Platform Engineer

similar roles.

Digital Information Security Architect 2

Deputy to Head Security - 80-100% (m/w/d)

Senior Project Manager (AdTech)

Senior Cyber Security Analyst

Penetration Tester

Cloud Security Architect