Penetration Tester

Penetration TesterLocation: Birmingham (Hybrid 2 days per week)Salary: £50,000 – £65,000 (depending on experience)We’re supporting our client in building an advanced testing capability focused on the resilience and assurance of next-generation telecommunications networks. This is a rare opportunity to work on projects that directly contribute to national cyber security and the protection of critical national infrastructure.The RoleYou’ll join a collaborative team of Penetration Testers and Security Researchers working on some of the most technically complex and high-impact challenges in the industry. You’ll be responsible for:Conducting detailed security testing and vulnerability assessments across telecoms and IT network components.Performing positive and negative testing, fuzzing, and protocol-level assessments on modern network functions.Researching and evaluating new and emerging network technologies to identify weaknesses before they reach production.Developing custom tooling, scripts, and automation to enhance and scale testing capabilities.Producing clear and high-quality technical reports that communicate risk, impact, and remediation recommendations.Working closely with security engineers, researchers, and developers to design and improve test methodologies.This role plays a key part in supporting the design and development of secure telecoms infrastructure and contributes directly to national security outcomes.About YouYou’ll bring hands-on penetration testing experience across complex systems, ideally within telecoms, networking, or embedded environments. We’re interested in professionals who are curious, analytical, and thrive on technical problem-solving.Key skills and experience:Strong understanding of modern IT or telecoms network architectures.Practical experience in testing protocols such as Diameter, HTTP/2, SCTP, or NGAP (or the aptitude to learn).Experience in developing scripts, fuzzers, or automation for testing environments.Ability to deliver structured, detailed technical documentation and risk analysis.A collaborative mindset with a genuine interest in advancing cyber security research.Additional InformationHybrid working is available, though the role requires regular presence at the Birmingham facility.Applicants must be eligible for SC clearance (or already hold it).This is a chance to be part of an ambitious mission shaping the security of next-generation UK networks combining hands-on testing, research, and innovation in a truly unique environment.