Penetration Tester (CHECK Team Member)

Location: London (Hybrid, 2–3 days onsite per week)

Salary: Up to £65,000 (depending on experience) + benefits

NOTE: Candidates must be be eligible for UK Security Clearance (SC)

This is an opportunity to join a high-performing cyber security team delivering offensive security services across enterprise IT and operational technology environments. The role is hands-on, technically challenging, and offers exposure to a wide variety of client systems, from traditional infrastructure to modern cloud and application stacks.

You will play a key role in identifying vulnerabilities, assessing risk, and providing actionable remediation guidance, working closely with both technical and non-technical stakeholders.

Key Responsibilities

• Conduct penetration testing across infrastructure, web applications, APIs, and cloud environments
• Deliver clear, concise, and actionable security assessment reports
• Translate technical findings into business risk for non-technical stakeholders
• Support the development of security requirements from high-level functional objectives
• Present findings and recommendations to clients in a professional and impactful manner
• Collaborate with internal teams and client stakeholders to ensure successful delivery

Required Skills & Experience

• CHECK Team Member (CTM) certification
• 3+ years’ commercial experience in penetration testing or offensive security
• Broad exposure across multiple testing domains (infrastructure, application, cloud)
• Strong understanding of common vulnerabilities (e.g. OWASP Top 10)
• Ability to work with limited information and still deliver structured, effective outcomes
• Excellent written and verbal communication skills

Desirable Experience

• Experience working within consultancy or client-facing environments
• Exposure to operational technology (OT) or industrial control systems
• Additional certifications such as CREST, OSCP, or equivalent

If you are a driven penetration tester ready to take on complex security challenges, apply today.