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As a Senior Security Penetration Tester, you will be responsible for supporting the design, implementation, and maintenance of TVM (Threat & Vulnerability Management) solutions, controls and processes across the organisation. You will be liaising with Digital teams to ensure appropriate mitigation and remediation of vulnerabilities detected across our IT estate.

This role requires an understanding of TVM concepts, technologies, and best practices, as well as the ability to collaborate effectively with cross-functional teams. The ideal candidate will possess strong communication skills and will be committed to ensuring the highest level of security, compliance, and user experience.

What you'll be doing as a Senior Security Penetration Tester

Help support and develop an internal penetration testing function.Conduct network, application penetration testing, code and security reviews.Identify and exploit vulnerabilities through proof-of-concept testing.Support vulnerability management across the enterprise, ensuring that a framework for identification, categorisation and mitigation exists and is implemented and maintained.Responsible for supporting the creation of the operating model for vulnerability management, which is shared, agreed and operates effectively across the business.Develop and maintain penetration testing documentation, policies, and procedures.Integrate cybersecurity solutions (e.g. vulnerability scanning tools) with existing systems, applications, and infrastructure.Evaluate and recommend technologies, tools, and vendors to meet business needs.Investigate newly identified cybersecurity vulnerabilities and provide appropriate mitigation actions.Liaise and coordinate with technology and business stakeholders in relation to cybersecurity patching and vulnerability management issues/actions.Maintain a cyber threat assessment methodology, align with evolving industry standards and integrate into BAU and project-based business processes.Support with proactive threat hunting for new and emerging cyber threats.Develop and maintain dashboards with cybersecurity threat and vulnerability metrics.Support compliance with relevant industry standards, regulations, and best practices, such as GDPR, NIS and ISO 27001.

What you should bring to the role

Strong knowledge of manual penetration testing techniques and confident with operating systems and tools such as Tenable, Burp Suite, Kalli Linux.Exposure to remediating vulnerabilities and patch management in a complex business environment.Experience in remediating cyber risks in the ever-changing digital estate.3 years of experience in a penetration testing enterprise environment.Prepare detailed reports and have the ability to present findings to key stakeholders.Cyber security industry certification(s) such as CSTM/ CRT/ OSCP/CTL.Understanding of different patching management techniques and approaches for different technology stacks (e.g. SaaS, IaaS, End-User Computing, Server Estate, etc.).

Knowledge of TVM concepts, technologies, and best practices, including OSINT tools, vulnerability assessment, threat modelling, etc

GCS is acting as an Employment Agency in relation to this vacancy.

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We're looking for someone with:

At least 5 years of experience in operations testing, with a focus on component and systems testing

A strong background in security compliance, ideally within a Defence environment

Hands-on experience with automation tools like Selenium, Appium, JUnit, or TestNG

Proficiency in scripting or programming languages such as Java, Python, or JavaScript

Relevant certifications such as ISTQB or CSTE (a plus, not a must)

The ability to lead, motivate, and collaborate with testing teams across fast-paced environments

This is a high-impact role offering the chance to work on meaningful defence-related projects in a supportive and innovative environment.

Would you be open to a quick chat to explore this further? Happy to share more details and hear about your current goals.

GCS is acting as an Employment Agency in relation to this vacancy.

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