Robert Half
Penetration Tester
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Senior Penetration Tester (AI-Enabled Vulnerability Research) | London Hybrid | £600 per day PAYE + 12.07% Holiday Pay
We're supporting a leading global consulting firm seeking an experienced Penetration Tester to join a high-profile cyber security initiative focused on AI-enabled vulnerability discovery, offensive security testing and application security assessment. This role combines traditional penetration testing expertise with the use of frontier AI models and advanced security tooling to identify genuine exploitable vulnerabilities across critical applications and internet-facing platforms. The successful Pen Tester will play a key role in validating security findings, reducing false positives and improving remediation outcomes.
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Contract Details:
- Rate: £600 per day PAYE + 12.07% Holiday Pay
- Location: London Hybrid (2-3 days per week)
- Start Date: ASAP Start c. 1st week of August
- Duration: Initial 6 month contract with potential extension
Key Experience Required:
- Strong Penetration Testing and Offensive Security experience
- Vulnerability Research and Security Assessment experience
- Web Application and API Security Testing
- Source Code Review and Secure Code Analysis
- Experience validating genuine exploitability and attack paths
- Knowledge of AI/LLM technologies and AI-assisted security testing
- Experience using AI tooling to support vulnerability discovery or code analysis
- Cloud Security knowledge (Azure, AWS or GCP)
- Strong stakeholder engagement and communication skills
- Ability to produce clear technical reports and remediation recommendations
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Desirable Experience:
- Red Teaming experience
- Bug Bounty or Security Research background
- Product Security or Application Security experience
- Experience developing AI-native security tooling, testing harnesses or guardrails
- Financial Services experience
- Relevant certifications such as OSCP, CREST, GPEN or similar
Ideal candidates will have proven penetration testing or vulnerability research experience alongside exposure to AI-assisted security testing, code analysis or AI-driven vulnerability discovery within large enterprise environments.
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