CSI GLOBAL LTD
Penetration Tester
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Job Title: Security Penetration Tester
Location: Sheffield, UK (Hybrid)
Contract: Inside IR35
Role Overview
We are seeking an experienced Security Penetration Tester / Red Team – AI to join our Cyber Security team and strengthen the security of enterprise AI platforms. You will be responsible for conducting offensive security assessments against AI systems, identifying vulnerabilities, and validating the resilience of Large Language Models (LLMs), AI applications, and Agentic AI environments against emerging attack techniques.
Key Responsibilities
- Conduct penetration testing and Red Team engagements focused on AI platforms, LLMs, and AI-powered applications.
- Assess AI systems for threats such as prompt injection, model abuse, jailbreak techniques, data poisoning, insecure plugins, and agentic exploitation.
- Perform application, API, cloud, and infrastructure security testing supporting AI workloads.
- Develop attack simulations to validate AI security controls and identify potential weaknesses.
- Work closely with Security Architecture, SOC, Engineering, and DevSecOps teams to remediate identified risks.
- Produce detailed technical reports, risk assessments, and remediation recommendations.
- Contribute to AI threat modelling, security testing methodologies, and Red Team playbooks.
- Stay up to date with emerging AI threats, adversarial machine learning techniques, and offensive security best practices.
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Required Skills & Experience
- 5+ years of experience in Penetration Testing, Red Teaming, or Offensive Security.
- Strong knowledge of Web Application, API, Network, Cloud, and Infrastructure Security Testing.
- Experience with penetration testing tools such as Burp Suite, Metasploit, Kali Linux, OWASP ZAP, Nmap, and related security tools.
- Good understanding of LLM security, AI attack techniques, and adversarial testing concepts.
- Familiarity with cloud platforms (Azure, AWS, or GCP) and container security.
- Knowledge of OWASP Top 10, MITRE ATT&CK, NIST, and secure development practices.
- Strong scripting skills in Python, Bash, or PowerShell.
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Nice to Have
- Experience testing Generative AI, LLMs, RAG, Agentic AI, or Machine Learning platforms.
- Certifications such as OSCP, OSWE, CREST CRT/CCT, CEH, GPEN, GXPN, or equivalent.
- Experience with AI security frameworks and adversarial machine learning.
- Banking or Financial Services domain experience.
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