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AI Security Tester

Job in Reading, Berkshire, RG1, England, UK
Listing for: Mastek
Full Time position
Listed on 2026-07-07
Job specializations:
  • IT/Tech
    Cybersecurity, AI Engineer (Applied/Software), Data Security
Salary/Wage Range or Industry Benchmark: 70000 - 90000 GBP Yearly GBP 70000.00 90000.00 YEAR
Job Description & How to Apply Below

Are you passionate about breaking AI systems before adversaries do? We’re looking for an AI Security Tester with deep offensive security expertise to help safeguard next-generation AI solutions.

In this role, you’ll simulate real-world attacks to uncover vulnerabilities in AI/ML systems. From stress-testing model guardrails to identifying data privacy risks, you’ll play a critical role in ensuring secure and trustworthy AI deployments.

Working Model

- Hybrid Role, when needed will have to travel to Mastek offices or customer location

  • Conduct adversarial testing to challenge AI model safety and guardrails
  • Perform penetration testing and fuzzing of AI systems
  • Identify risks such as data poisoning, model evasion, hallucinations, and bias
  • Validate data privacy controls, including PII handling and encryption
  • Simulate attack scenarios and exploit attempts
  • Document vulnerabilities, unexpected behaviours, and evidence in lower environments
  • Analyse threat vectors and recommend mitigation strategies
  • 5+ years in offensive cybersecurity (App Sec, Pen Testing, Red Teaming)
  • Minimum 2 years focused on AI/ML security
  • Strong programming skills in Python / Java
  • Hands-on experience with ML frameworks (e.g.,
    PyTorch, Tensor Flow
    )
  • Familiarity with AI tooling (e.g.,
    Lang Chain, Llama Index, red-teaming toolkits
    )
  • Proven ability to assess and secure AI systems end-to-end
Nice to Have
  • Master’s degree in Computer Science, Cybersecurity, AI/ML, or related field
  • Certifications such as CISSP or AI security/safety credentials
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