Executive / Senior Pentester - London 250,00 - 300,000 package (Inhouse/ FS)

Job DescriptionSenior Penetration Tester -300,000+ Total Package (150,000 - 200,000 fixed) + Sign On + Bonus Entasis Partners are proud to be exclusively supporting a global organisation at the forefront of innovation in financial systems and high-performance computing.This is not your average security role. Our partner operates in a deeply technical, high-trust environment where the scale of data, the pace of experimentation, and the calibre of internal talent make for an exceptionally challenging and rewarding opportunity.With a newly developed central London site focused on next-generation research, this firm is seeking a Senior Penetration Tester to strengthen its already world-class internal security capability.The OpportunityThis is a hands-on, highly autonomous role embedded within a specialist cyber function. Youll be trusted to scope, execute, and deliver sophisticated penetration tests and control assessments across a range of technologies including Kubernetes, Jenkins, and Windows-based infrastructure.More than just finding issues, youll work in partnership with teams across the business to advise, remediate, and embed meaningful improvements. The environment is agile, collaborative, and engineered for depth not red tape.What Youll Be DoingLeading advanced penetration tests across infrastructure, applications, and DevOps pipelinesProviding clear, actionable advice to technical and business stakeholdersAssessing the effectiveness of existing security controls through hands-on testingWorking closely with Detection, Risk and Compliance teams to provide assurance and technical insightEnhancing internal tools and frameworks to drive automation and assessment efficiencyCoaching and supporting junior colleagues through knowledge sharing and collaborationWhat Were Looking ForYoull bring deep technical experience, natural curiosity, and the confidence to challenge assumptions. You may have worked in financial services, or equally in fast-paced engineering environments but what matters is your capability and judgement.Must-haves include:Strong penetration testing experience from planning to execution and reportingUnderstanding of vulnerability management and secure systems designFamiliarity with DevSecOps tooling and scripting (e.g., Python, Jenkins, Ansible)Strong grasp of how to assess and break technical controls and explain fixesOSCP certification (required); CRT, OSEP or similar a strong bonusClear, professional communication skills with both technical and non-technical teamsWhy Apply?Exceptional total compensation ~240,000+ package (base + discretionary bonus)30 days annual leave + flexible working environment9% employer pension contributionDaily lunch allowance and on-site barista coffeePrivate healthcare and life assuranceMonthly socials, company events, and modern informal cultureCycle-to-work scheme and premium office facilitiesThis is an opportunity to test your skills at the very highest level with the tools, talent, and environment to match.To learn more or arrange a confidential conversation, please contact Entasis Partners directly.

Created: 2025-11-05