Full Stack Engineer (£120k-£130k + Equity) at Aisy

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 Full Stack Engineer Salary £120k-£130k + Equity Company Description Aisy.ai is a $2.3M seed-funded cybersecurity startup building an AI-native vulnerability management engine. Founded by the former head of Hacker R&D at HackerOne, the team is backed by 6 Degrees Capital, Flying Fish Ventures, Osney Capital, and angel investors from DeepMind, Cisco, and 1Password. Job Description Join Aisy.ai as a Full Stack Engineer to build an AI-driven platform that prioritizes cybersecurity threats using real-world attacker logic. You will work directly with the founder to develop Python backends, React frontends, and core ML systems, transforming how organizations manage vulnerabilities by focusing on exploitable attack paths rather than noise. Location London, UK Why this role is remarkable Work directly alongside founder Shlomie Liberow, a world-class security expert who led Hacker R&D for HackerOne and managed programs for the UK Ministry of Defence. Join a small, high-impact team of four as an early employee, gaining massive ownership over a product targeting a $17B+ market with unique AI-native technology. Engage in deep technical challenges across the stack, from building autonomous agentic AI features and ML evaluation pipelines to designing complex authorization logic for enterprise customers. What You Will Do Develop and scale end-to-end features using a Python and Prefect backend coupled with a modern React frontend to deliver actionable security insights. Own the core ML lifecycle, including model training, evaluation pipelines, and the implementation of agentic AI features that simulate real-world attacker perspectives. Collaborate closely with customers to rapidly prototype, build, and ship features that address critical pain points in how organizations defend against complex vulnerability chains. The ideal candidate Has 2-6 years of professional full-stack experience with strong engineering fundamentals in Python and modern frontend frameworks like React. Possesses genuine depth in Machine Learning, understanding model training and evaluation techniques beyond simple API consumption to build robust AI-native products. Thrives in fast-paced startup environments, demonstrating curiosity, a builder's mindset, and the ability to ship high-quality code that solves real-world customer problems. 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.