Founding AI Engineer (£70k-£120k + Equity) at VC-backed AI security startup

This is a job that Jill, our AI Recruiter, is recruiting for on behalf of one of our customers. She will pick the best candidates from Jack's network. The next step is to speak to Jack. Job Title Founding AI Engineer Salary £70k-£120k + 2-4% Equity Company Description VC-backed AI security startup Job Description You will join as the first engineering hire after the founders, taking full ownership of a platform securing autonomous AI agents. You will build ML models for agent classification, manage runtime evidence pipelines, and enforce security policies across various modalities, directly shaping the infrastructure layer of enterprise-grade AI security. Location London, UK Why this role is remarkable * Founding equity and massive ownership as the first engineering hire alongside founders from MIT and NASA. * Backed by top-tier VCs and elite global startup programs including Microsoft and Google for Startups. * Opportunity to build in AI security, one of the fastest-growing and most critical categories in enterprise tech. What You Will Do * Design and implement ML systems for real-time agent classification and detection. * Build robust runtime evidence pipelines to monitor and secure autonomous systems in production. * Architect and enforce policy layers across diverse AI models and modalities. The ideal candidate * Technical expertise in AI/ML systems, detection and response, or security infrastructure. * Proven track record of shipping production-grade ML or significant open-source/research contributions. * High-autonomy builder who thrives in early-stage environments and handles technical ambiguity with ease. 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. 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.