Jack & Jill
Founding AI Security Engineer / Researcher at Refractal
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Founding AI Security Engineer / Researcher
Salary
Not Disclosed
Company Description
Refractal is a London-based startup building security infrastructure for autonomous AI, backed by recognition from MIT CSAIL Alliances and selection for Google’s Gemini Cybersecurity Startup Forum.
Location
London, UK
Why this role is remarkable
- Join as the first security hire at an early-stage startup founded by a high-pedigree technical team from MIT, NASA, Microsoft, and government.
- Gain direct access to real, high-consequence AI deployments for leading startups and a European government rather than working in synthetic research environments.
- Build category-defining infrastructure to address emerging threats like multi-agent collusion and agentic data exfiltration that traditional cyber companies cannot solve.
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What You Will Do
- Red-team production and pre-production AI agents across browser, code, and enterprise environments to discover novel exploits involving prompt injection and tool abuse.
- Build automated adversarial testing infrastructure, attack agents, and reusable security test suites to evaluate complex agentic architectures and trust relationships.
- Translate security research findings into concrete runtime detections, policy controls, and product requirements that directly influence the Refractal roadmap.
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The ideal candidate
- Demonstrated expertise in offensive security, AI red-teaming, or vulnerability research with an adversarial mindset and a proven ability to build security tools.
- Practical understanding of modern LLM architectures, including tool calling, RAG, and orchestration, alongside proficiency in Python and systems languages.
- Ability to work independently on technically ambiguous problems and communicate rigorous, actionable findings to founders and high-profile customers.
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