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Founding AI Security Engineer / Researcher

refractal • United Kingdom
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This Job is No Longer Active This position is no longer accepting applications

Join Refractal's founding team to build security infrastructure for autonomy. Break agentic systems before adversaries do, and turn research into repeatable evaluations, customer insights, and production security controls. Work across research, offensive engineering, and product development.

Key Highlights
Break agentic systems before adversaries do
Turn research into repeatable evaluations, customer insights, and production security controls
Work across research, offensive engineering, and product development
Key Responsibilities
Red-teaming production and pre-production AI agents across browser, code, enterprise, and multi-agent environments
Discover and demonstrate novel attacks involving prompt injection, goal manipulation, memory poisoning, tool abuse, agent identity, privilege boundaries, and data exfiltration
Develop realistic exploit chains that cross model, application, identity, tool, and infrastructure layers
Technical Skills Required
Python Security Machine Learning
Benefits & Perks
Competitive salary
Meaningful founding equity
Performance-linked bonus

Job Description

About Us

Refractal is building security infrastructure for autonomy. Our founding team combines technical pedigree from MIT, NASA, Microsoft, and government with commercial experience in VC and startups. We have also been recognised by MIT's flagship CSAIL AI lab as part of CSAIL Alliances, as well as being selected for Google's highly selective Gemini Cybersecurity Startup Forum.

We are today working with leading startups and a European government to secure their AI deployments. This role is an opportunity to join an ambitious, fast-paced startup at the very earliest stages.

The Mission

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