This range is provided by InfoSec People Ltd. Your actual pay will be based on your skills and experience — talk with your recruiter to learn more.

Base pay range

National cyber & telecoms testing environment

We’re working with a major national telecoms and cyber security programme building a world-class research and testing facility to help secure the UK’s communications networks and accelerate innovation in next-generation connectivity.

As part of this initiative, we’re hiring Penetration Testers who will identify vulnerabilities across the hardware, software, and platforms that power the UK’s critical digital infrastructure. You’ll test everything from 5G and core network components to virtualised environments and bespoke tooling, with the work you are doing directly strengthening national resilience.

This is not your typical pen-testing role. You’ll operate at the intersection of offensive security, telecoms, and R&D, working alongside engineers and researchers to uncover complex vulnerabilities and improve the security of the UK’s network ecosystem.

What You’ll Be Doing

• Conduct hands-on security testing of modern IT and telecoms network components.
• Perform protocol fuzzing, positive/negative testing, and exploit development across complex network functions.
• Develop or script custom tooling for automated and repeatable testing.
• Analyse results, identify weaknesses, and deliver clear, high-impact technical reports.
• Collaborate with software engineers and vulnerability researchers to evolve testing techniques and methodologies.

What We’re Looking For

We’re hiring mid-level through to senior penetration testers who bring curiosity, depth, and hands-on skill.

• Proven experience in penetration testing or security research (offensive or red-team work).
• Strong grasp of network or telecoms protocols (e.g. Diameter, HTTP/2, SCTP, NGAP, SIP).
• Experience with fuzzing frameworks or test automation (e.g. AFL, Peach, boofuzz, Scapy, Burp extensions, etc.).
• Ability to produce clear, risk-based technical reporting.
• UK Security Clearance (SC) or eligibility to obtain it.
• Experience testing telecoms stacks (4G/5G Core, Open RAN, IMS).
• Scripting experience (Python, Go, Bash, or C/C++).
• CREST, OSCP, or similar certifications (would be desirable).

Why Join

• Work on real, national-scale infrastructure that matters.
• Access to cutting-edge telecoms and cyber equipment.
• Collaborate with industry, academia, and government-backed research experts.
• Hybrid working from Birmingham with flexible options.
• Be part of a mission-driven team shaping the UK’s secure telecoms future.

Interested?

Apply now or reach out for a confidential chat.

This is a rare opportunity to use your technical skills to make a tangible impact on the security of the UK’s most critical systems!

Seniority level

• Mid-Senior level

Employment type

• Full-time

Job function

• Information Technology

Industries

• Computer and Network Security

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