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Senior Penetration Tester
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Careers Site Advertising End Date
30 Nov 2025
Internal Advertising End Date
30 Nov 2025
All Locations
Birmingham, United Kingdom All Locations is a required field
All Departments
UK Telecoms Lab All Departments is a required field
Advertising Salary:
negotiable
Vacancy Type
Permanent

• Senior Penetration Tester

About the Role
Security Testing Role - Dive Deep, Make an Impact
You're motivated by a deep curiosity and a dedication to excellence. Whether dissecting telecoms protocols or navigating the intricacies of enterprise IT systems, you thrive on appreciation how things work - and how they can be fortified. Your approach is hands-on and analytical, grounded in experience and a clear sense of purpose: making systems more secure and resilient.
In this role, you'll join a collaborative, inclusive team that values expertise, diverse perspectives, and mutual support. You'll have the opportunity to mentor and guide emerging talent, shaping the next generation of penetration testers. We'll give you the freedom to explore, experiment, and grow - while contributing to the development of robust, secure networks that have real-world impact
What You'll Be Doing

• As a senior member of the team, you'll play a pivotal role in shaping and delivering security assessments across complex hardware and software systems. Your responsibilities will include:
• Steering technical assessments of telecoms equipment, identifying vulnerabilities and guiding the direction of testing activities.
• Mentoring and supporting junior team members, fostering their development through hands-on guidance and knowledge sharing.
• Applying advanced testing techniques, including both positive and negative approaches such as fuzzing, to rigorously evaluate network functions and protocols.
• Scripting and automating assessments to enhance efficiency, consistency, and scalability across projects.
• Investigating and articulating findings.
• Contributing to high-quality technical reports, ensuring they are thorough and insightful.
• Helping to shape the test strategy.

Successful Applicants must be able to commute to the UKTL offices in Birmingham at least twice a week
We strive to offer a great work life balance - if you are looking for full time, part time or flexible options, we will try to make this work where business possible. This will be dependent on the kind of role you do and part of the business you work in.
About You
What We're Looking For

• We're seeking individual's who brings both depth of experience and a collaborative mindset to the team. Ideally, you:
• Thrive in complex technical environments, with a proven ability to dissect and solve challenging problems across diverse systems.
• Contribute fresh perspectives, while working effectively with colleagues across disciplines to drive innovation and shared success.
• Demonstrate a genuine passion for security testing, with a commitment to continuous learning and staying ahead of emerging threats.
• Have hands-on experience in penetration testing, coupled with a solid understanding of exploitation techniques and how they apply in real-world scenarios.

What You'll Learn
You'll either bring existing knowledge of telecoms protocols like Diameter, HTTP/2, SCTP, NGAP- or show the curiosity and aptitude to learn. Either way, we'll promote your growth.
You'll get access to top-tier learning platforms, including:

• Offensive Security Learn Unlimited Subscription with Exam attempts included.
• Hack The Box
• PentesterLab subscription
• Plus telecoms-specific online learning resources

If this sounds like you, we'd love to hear from you. Let's build something secure together.
Please note: Applications will be reviewed, and interviews conducted throughout the duration of this advert therefore we may at any time bring the closing date forward. We encourage all interested applicants to apply as soon as practical.
We actively recruit citizens of all backgrounds, but the nature of our work in this specific area means that nationality, residency and security requirements are more tightly defined than others. To work in this role, you will need to have an SC clearance with no restrictions, or you must have the ability to obtain an SC clearance.
About Us
UKTL is building leading edge Telecoms testing facilities to keep our telecommunications networks safe, accelerate the roll-out of new technologies, and grow our world leading telecoms sector to maintain resiliency and security.
Read more about UKTL !
Successful candidates will join a state-of-the-art facility and be supporting the team conducting testing and research on the latest technologies and innovations in the industry. You will work alongside our infrastructure and Cybersecurity professionals to ensure that the UK's world class Telecoms infrastructure grows in a resilient and secure manner underpinning growth in other industry sectors.
As a trusted and independent national capability, UKTL interacts with standards bodies, Academia, and Government Departments as well as Communications Service Providers and equipment vendors.
The National Physical Laboratory (NPL) is a world-leading centre of excellence that provides cutting-edge measurement science, engineering and technology to underpin prosperity and quality of life in the UK. Find out more about what it is like working here -
NPL and DSIT have strong commitments to diversity and equality of opportunity, and welcome applications from candidates irrespective of their background, gender, race, sexual orientation, religion, or age, providing they meet the required criteria. Applications from women, disabled and black, Asian and minority ethnic candidates in particular are encouraged. All disabled candidates (as defined by the Equality Act 2010) who satisfy the minimum criteria for the role will be guaranteed an interview under the Disability Confident Scheme.
At NPL, we believe our success is a result of the diversity and talent of our people. We strive to nurture and respect individuals to ensure everyone feels valued by treating everyone on the basis of their own individual merits and abilities regardless of their own or perceived identity, as part of our commitment to diversity & inclusion, we ensure we're creating an environment where all our colleagues feel supported and welcome. More about this on our page. We offer a wealth of above industry standard benefits, such as enhanced pension scheme, flexible working, and more that can be found here . are at the heart of what we do, and they shape the way we interact, develop our people and celebrate success. To ensure everyone has an equal chance, we're always willing to make reasonable adjustments to the recruitment process. If you would like to discuss, please

Skills Required