Senior Penetration Tester

New Yesterday

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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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