> Markdown version of [/jobs/ext/4666412-lead-pentester-sc-cleared](https://www.wearedevelopers.com/jobs/ext/4666412-lead-pentester-sc-cleared). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Lead Pentester - SC Cleared - **Company:** Ncsc - **Location:** Winterbourne, United Kingdom - **Experience:** Expert - **Contract:** Permanent contract - **Skills:** Application Programming Interfaces (APIs), Amazon Web Services, Software System Penetration Testing, Microsoft Azure, Bash Shell, Cloud Computing, Cyber Security, Python (Programming Language), Windows PowerShell, Service Development Studio, Web Applications, Wireless Networks, Scripting, Mitre Att&ck, SC Clearance, Operational Systems - **Published:** November 11, 2026 - **Apply:** https://www.apply4u.co.uk/jobs/lead-pentester-sc-cleared/55699690 ## About the Role Current CREST CHECK Team Leader (CTL) qualification - essential. Strong hands-on penetration testing experience across infrastructure, applications, cloud or other complex environments. Experience planning, leading and delivering penetration testing engagements. Excellent technical report writing and the ability to communicate findings to technical and non-technical audiences. Strong stakeholder management and client-facing consulting skills. Good understanding of cyber security frameworks, standards and best practices. Experience with scripting or automation using Python, PowerShell, Bash or similar. Strong analytical and problem-solving skills. Ability to obtain SC Security Clearance, potentially progressing to higher levels of clearance. Willingness to travel to customer sites when required. Desirable Experience Existing SC or DV Security Clearance. Experience working within Defence, MOD, Government or National Security environments. Additional certifications such as CREST CCT, OSCP, OSEP, OSWE or CRTO. Cloud penetration testing experience across AWS, Azure or GCP. Operational Technology (OT/ICS) security testing experience. Experience developing penetration testing tools, automation or frameworks. Knowledge of NCSC CAF, NIST, ISO 27001 and MITRE ATT&CK. Experience mentoring junior penetration testers or conducting technical quality assurance. ## Description We are looking for an experienced Lead Penetration Tester / CHECK Team Leader (CTL) to join a growing Offensive Security team within a leading defence and cyber security environment. This is an exciting opportunity for a technically strong penetration testing professional to take ownership of complex security engagements across Defence, Government and Critical National Infrastructure. You'll be working on challenging, high-assurance environments, helping to identify vulnerabilities, strengthen security controls and protect critical systems. This position offers much more than hands-on penetration testing. You'll have the opportunity to provide technical leadership, mentor junior consultants, contribute to service development and help shape the future of an expanding Offensive Security capability. Key Responsibilities Lead and deliver penetration testing engagements across infrastructure, web applications, APIs, cloud, wireless networks and Operational Technology (OT). Plan and scope testing engagements, ensuring alignment with NCSC CHECK standards and industry best practices. Provide technical leadership and quality assurance across penetration testing activities. Produce detailed technical and executive reports, clearly communicating vulnerabilities, business risks and remediation recommendations. Work closely with customers and key stakeholders to understand security requirements and deliver effective testing solutions. Support and mentor junior penetration testers and CHECK Team Members. Contribute to the development of offensive security methodologies, tooling, automation and service offerings. Stay up to date with emerging threats, attack techniques and vulnerabilities.