Senior Penetration Tester - £700 to £800 (Inside IR35) - 6-12 months

Senior Penetration Tester - £700 to £800 per day (Inside IR35)

Hybrid working - 1 to 2 days per week in the office (Ideally London)

Contract Senior Penetration Tester responsible for leading AI-enabled vulnerability research and bug-hunting across priority applications, with initial focus on internet-facing assets. The role combines deep manual offensive testing with frontier-model-assisted discovery, exploit validation (including chaining), risk-based triage, and remediation enablement. Focus is on identifying real exploitable risk quickly, preventing triage backlog growth, and improving security engineering outcomes through repeatable testing standards and guardrails.

Project Context

• Critical programme addressing AI-related security threats
• Strong executive visibility
• Building a new specialist squad within Cyber Security
• Work will be iterative and agile, focused on identifying and remediating vulnerabilities

Role Purpose

• Combine traditional penetration testing with AI capabilities
• AI-enabled vulnerability research
• Perform end-to-end testing, including:
• Source code review using AI
• Manually validating vulnerabilities

Key Requirements (Must-Have)

• Experience with:
• Vulnerability research
• Pen testing tools, methodologies, and processes
• Hands-on experience using AI/LLMs
• Experimenting with AI for security testing
• Using LLMs for automation or research
• Ability to:
• Validate AI-generated findings manually
• Translate findings into actionable insights

Nice-to-Have

• Experience building or automating AI-driven testing workflows
• Bug bounty / research background
• Advanced experimentation with LLMs in security contexts