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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 Opportunity
This is a hands-on, highly autonomous role embedded within a specialist cyber function. You’ll 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, you’ll 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 You’ll Be Doing
* Leading advanced penetration tests across infrastructure, applications, and DevOps pipelines
* Providing clear, actionable advice to technical and business stakeholders
* Assessing the effectiveness of existing security controls through hands-on testing
* Working closely with Detection, Risk and Compliance teams to provide assurance and technical insight
* Enhancing internal tools and frameworks to drive automation and assessment efficiency
* Coaching and supporting junior colleagues through knowledge sharing and collaboration
What We’re Looking For
You’ll 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 reporting
* Understanding of vulnerability management and secure systems design
* Familiarity with DevSecOps tooling and scripting (e.g., Python, Jenkins, Ansible)
* Strong grasp of how to assess and break technical controls — and explain fixes
* OSCP certification (required); CRT, OSEP or similar a strong bonus
* Clear, professional communication skills with both technical and non-technical teams
Why Apply?
* Exceptional total compensation ~£240,000+ package (base + discretionary bonus)
* 30 days’ annual leave + flexible working environment
* Daily lunch allowance and on-site barista coffee
* Private healthcare and life assurance
* Monthly socials, company events, and modern informal culture
* Cycle-to-work scheme and premium office facilities
This 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.
Seniority level
* Seniority level
Director
Employment type
* Employment type
Full-time
Job function
* Job function
Information Technology
* Industries
Technology, Information and Media and Computer and Network Security
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