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Founding AI Engineer

refractal • United Kingdom
Visa Sponsorship
This Job is No Longer Active This position is no longer accepting applications
AI Summary

Join Refractal as a Founding AI Engineer to build security infrastructure for autonomy. Develop the runtime classification stack, design policy enforcement, and build evidence pipelines. You'll have significant autonomy and a path to becoming Head of Engineering.

Key Highlights
Developing the runtime classification stack
Designing policy enforcement at the action boundary
Building evidence pipelines that record every AI action, verdict, and rationale

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Key Responsibilities
Developing the runtime classification stack that decides whether an agent's proposed action is authorised before it executes.
Designing policy enforcement at the action boundary: allowing, blocking, or letting flagged actions proceed with sensitive data redacted.
Building evidence pipelines that record every AI action, verdict, and rationale.
Developing the policy engine that compiles natural-language policies and regulation into executable runtime controls.
Building multimodal ingestion and detection.
Collaborating with our security research function to turn novel attacks into shipped detections and controls.
Owning systems end to end and shipping to production with real, high-consequence customer deployments.

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Technical Skills Required
Machine Learning Cybersecurity Computer Science

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Benefits & Perks
Competitive salary
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 regulated 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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Job Overview
Posted Jul 24, 2026
Employment Full-time
Experience Entry level
Location United Kingdom
Category Programming
Company refractal
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