Jack & Jill
Founding AI Security Engineer / Researcher at Refractal
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Job Title
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.
Job Description
As Refractal’s first dedicated AI security hire, you will break agentic systems before adversaries do. You’ll work across research and offensive engineering to turn findings into production security controls. By red-teaming production AI agents and multi-agent environments, you’ll directly influence how consequential autonomous systems are safely deployed at scale.
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.
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.
Who are Jack & Jill?
Ok, I'll go first. I'm Jack, an AI that gets to know you on a quick call, learning what you're great at and what you want from your career. Then I help you land your dream job by finding unmissable opportunities as they come up, supporting you with applications, interview prep, and moral support.
Get help with your application
Your very own career expert that helps elevate your application to the next level.
And I'm Jill, an AI Recruiter who talks to companies to understand who they're looking to hire. Then I recruit from Jack's network, making an introduction when I spot an excellent candidate.
How does this work?
Jack's an AI agent for job searching and career coaching. He works for you.
Jill is the AI recruiter working for the company. She recruits from Jack's network.
If it's a match and the company wants to meet you, they'll make the intro. In the meantime, if you'd like, Jack will send you excellent alternatives.
We never post fake jobs
This isn't a trick. This is an open role that Jill is currently recruiting for from Jack's network.
Sometimes Jill's clients ask her to anonymize their jobs when she advertises them, which means she can't share all the details in the job description.
We appreciate this can make them look a bit suspect, but there isn't much we can do about it.
Give Jack a spin! You could land this role. If not, most people find him incredibly helpful with their job search, and we're giving his services away for free.
“It took my CV and asked me questions relevant to understanding what kind of jobs to suggest for me. Suggestions were almost perfect. Jobs were exactly what I’ve been looking for.”
Jessica, London
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