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AI Security Engineer

refractal • United Kingdom
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Test deployed AI systems and agents under adversarial conditions to identify vulnerabilities and strengthen defences. Design and execute security assessments of AI applications, build reproducible test cases, and collaborate with engineering teams to implement mitigations. Requires hands-on offensive security experience, understanding of web/API security, and knowledge of AI application trust boundaries.

Key Highlights
Test AI applications and agents for adversarial failures including prompt injection, data exposure, and permission boundary violations
Build reproducible test cases and automated tools to demonstrate security impact and validate fixes
Work with engineering and research teams to turn findings into stronger defences and repeatable regression tests
Key Responsibilities
Design and execute assessments of AI applications and agents, grounded in realistic attacker goals and clearly defined test scope
Test realistic threats such as indirect prompt injection, misuse of connected tools, sensitive data exposure and attempts to cross permission boundaries
Build reproducible test cases and small testing tools that demonstrate security impact and distinguish reliable failures from one-off outputs
Analyse how model behaviour, application design, identity and permissions combine to create vulnerabilities
Document findings, recommend practical mitigations and retest fixes with the engineers responsible for the affected systems
Technical Skills Required
Offensive security Application security testing AI/LLM security
Benefits & Perks
Salary: £65,000–£125,000
Competitive equity
Pension contribution
Private medical and dental cover
Visa and relocation support
Nice to Have
Experience assessing LLM applications, agent workflows or systems that retrieve external content
Experience building security evaluation suites or testing proposed mitigations systematically
Experience combining application testing with cloud, identity or infrastructure security assessment

Job Description

About Refractal

Refractal is an AI security company building the infrastructure organisations need to defend against autonomous AI threats. 2026 has shown that generally capable intelligence is here. The challenge now is modernising security to stop AI-enabled threats, whether they come from internal agents going rogue or from attackers using AI to become more dangerous.

Refractal was founded on cybersecurity and AI expertise from MIT, Microsoft, NASA and the U.S. Navy. Our product lets organisations detect AI-enabled threats at low cost without sacrificing detection quality. We take a practical approach to AI risk, combining proven cybersecurity methods with frontier AI security research.

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