At a Glance
- Tasks: Lead advanced penetration tests and provide actionable security advice.
- Company: Global leader in financial systems and high-performance computing.
- Benefits: Exceptional salary package, flexible working, and generous annual leave.
- Other info: Collaborative culture with excellent career growth and modern office facilities.
- Why this job: Test your skills at the highest level in a dynamic, innovative environment.
- Qualifications: Strong penetration testing experience and OSCP certification required.
Job Description
Senior 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 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
- 9% employer pension contribution
- 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.
Executive / Senior Pentester - London £250,00 - £300,000 package (Inhouse/ FS) in City of London employer: Entasis Partners
Join a pioneering global organisation in the heart of London, where innovation meets high-performance computing. As an Executive/Senior Pentester, you'll thrive in a collaborative and agile environment that prioritises depth over bureaucracy, offering exceptional compensation, generous benefits, and ample opportunities for professional growth. With a focus on cutting-edge technology and a culture that fosters knowledge sharing, this role is perfect for those looking to make a meaningful impact in the financial services sector.
StudySmarter Expert Advice🤫
We think this is how you could land Executive / Senior Pentester - London £250,00 - £300,000 package (Inhouse/ FS) in City of London
✨Tip Number 1
Network like a pro! Get out there and connect with folks in the industry. Attend meetups, conferences, or even online webinars. The more people you know, the better your chances of landing that dream role.
✨Tip Number 2
Show off your skills! Create a portfolio showcasing your penetration testing projects. Whether it's a blog, GitHub repo, or a personal website, let your work speak for itself. This is your chance to shine!
✨Tip Number 3
Prepare for interviews by practising common questions and scenarios. Think about how you'd approach a penetration test and be ready to discuss your thought process. Confidence is key, so rehearse until you feel ready to impress!
✨Tip Number 4
Don't forget to apply through our website! We’ve got loads of opportunities waiting for you. Plus, it’s a great way to ensure your application gets the attention it deserves. Let’s get you that job!
We think you need these skills to ace Executive / Senior Pentester - London £250,00 - £300,000 package (Inhouse/ FS) in City of London
Some tips for your application 🫡
Tailor Your CV:Make sure your CV is tailored to the role of Senior Penetration Tester. Highlight your relevant experience, especially in penetration testing and any specific technologies mentioned in the job description like Kubernetes or Jenkins.
Craft a Compelling Cover Letter:Your cover letter should reflect your passion for cybersecurity and your understanding of the financial services sector. Use it to showcase your problem-solving skills and how you can contribute to our innovative environment.
Showcase Your Technical Skills:Don’t just list your skills; demonstrate them! Include specific examples of past projects or challenges you've tackled that relate to penetration testing and security assessments. This will help us see your hands-on experience.
Apply Through Our Website:We encourage you to apply directly through our website. It’s the best way for us to receive your application and ensures you’re considered for this exciting opportunity. Plus, it makes the process smoother for everyone!
How to prepare for a job interview at Entasis Partners
✨Know Your Tech Inside Out
Make sure you’re well-versed in the technologies mentioned in the job description, like Kubernetes and Jenkins. Brush up on your penetration testing techniques and be ready to discuss specific scenarios where you've successfully executed tests.
✨Showcase Your Problem-Solving Skills
Prepare to share examples of how you've identified vulnerabilities and provided actionable advice to both technical and non-technical teams. This role is all about collaboration, so demonstrate your ability to communicate complex ideas clearly.
✨Be Ready for Hands-On Challenges
Expect practical assessments during the interview. Practice your skills in a lab environment, focusing on real-world scenarios that you might encounter in this role. Being able to think on your feet will impress your interviewers.
✨Highlight Your Coaching Experience
Since the role involves mentoring junior colleagues, be prepared to discuss your experience in knowledge sharing and collaboration. Share specific instances where you’ve helped others grow their skills in penetration testing or security.
