Senior Penetration Tester

UBDS

Senior Penetration Tester leading complex CHECK and commercial engagements at 3B Data Security. Mentoring juniors, maintaining CHECK Green status, and building client relationships in a hybrid role.

Posted 6/3/2026full-timeLondon • 🇬🇧 United KingdomSeniorWebsite

Tech Stack

Tools & technologies

React

About the role

Key responsibilities & impact

Being the Lead Penetration Tester on a wide portfolio of penetration testing engagements including complex CHECK engagements and ITHCs as well as and large projects for our key clients.
Working with senior management to maintain CHECK Green Status.
Creating high quality reports, ensuring complex technical data is conveyed in a way that is meaningful for customers.
Mentor and coach more junior members of the team to help them to grow and develop their career.
Build meaningful relationships with customers, ensuring they are kept up to date on the progress of the engagement and any pertinent findings in a timely manner.
Acting as a subject matter expert, supporting customers to better understand their situation and the value that 3B Data Security can bring to their organisation.
Provide technical presales support where necessary, to assist in the scoping of new engagements.
Identify business development opportunities, assisting in the development and implementation of such opportunities.

Requirements

What you’ll need

A CTL qualification in applications is essential and a required prerequisite.
A second CTL qualification in applications would be bonus.
Chartered or Principal CSP.
A solid background in penetration testing with demonstrable experience of working at a senior level.
An ability to achieve and hold UK security clearance is essential.
Demonstrable experience of leading a team to achieve high quality outcomes.
You must be passionate and enthusiastic for penetration testing and be proactive to increase your knowledge and skills in this area.
You must have excellent communication skills and be customer focused.
You will be self-motivated and be able to work autonomously.
Due to the nature of the role, ideally you would have your own transport and be able to react at short notice when needed.

Benefits

Comp & perks

Training – All team members are offered a number of options in terms of personal development, whether it is technical led, business acumen or methodologies. We want you to grow with us and to help us achieve more
Private medical cover for you and your spouse/partner, offered via Vitality
Discretionary bonus based on a blend of personal and company performance
Holiday – You will receive 25 Days holiday, plus 1 day for Birthday and 1 day for your work anniversary in addition to UK bank holidays
Electric Vehicle leasing with salary sacrifice
Contributed Pension Scheme
Death in service cover

ATS Keywords

✓ Tailor your resume

Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills & Tools

penetration testingCHECK engagementsITHCstechnical reportingbusiness developmentteam leadershipsecurity clearance

Soft Skills

mentoringcoachingcommunicationcustomer focusself-motivationproactivityrelationship building

Certifications

CTL qualificationChartered CSPPrincipal CSP