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About the Role
You'll test how deployed AI systems and agents fail under adversarial pressure. You'll run authorised, controlled security assessments, show what each finding means in practice, and work with our engineering and research teams to turn findings into stronger defences and repeatable tests.
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.
Requirements
- Hands-on experience in offensive security, application security testing or adversarial testing of AI systems.
- A solid understanding of web applications, APIs, authentication, authorisation and common security failure modes.
- An understanding of how AI applications use prompts, retrieved information, memory and connected tools, and where trust boundaries arise.
- The ability to write code that automates testing, reproduces findings and inspects application behaviour.
- Good judgement around test scope and sensitive data, and the ability to explain technical findings in terms of practical impact.
- 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.
Skills
- Offensive security
- Application security testing
- Adversarial testing of AI systems
- Web applications
- APIs
- Authentication
- Authorisation
- AI applications
- Prompt injection
- Data exposure
- Permission boundaries
- LLM applications
- Agent workflows
- Cloud security
- Identity security
- Infrastructure security
Location
- Remote
Work Type
- Full-time
Experience Level
- Mid-level
- Senior
Salary/Compensations
- £65,000–£125,000
Benefits
- Competitive equity
- Pension contribution
- Private medical cover
- Private dental cover
- Visa support
- Relocation support
About the Company
- Refractal is an AI security company building the infrastructure organisations need to defend against autonomous AI threats.
- 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.
- Today, we work with governments and organisations that can't afford to get security wrong.
- We're backed by leading deep-tech and cybersecurity investors and are growing the team to deliver on this mission.