Lead Product Engineer

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 Lead Product Engineer Salary £100k-£180k + Equity Company Description Artificial Societies Ltd is a venture-backed startup supported by Y Combinator, Point72 Ventures, and Kindred Capital, building large-scale simulated populations to help Fortune 500 organizations understand real-world audiences in hours instead of months. Job Description As Lead Product Engineer at Artificial Societies Ltd, you will own the end-to-end lifecycle of high-impact features, bridging the gap between advanced simulation research and intuitive user experiences. Working directly with the CTO, you will define architectural standards, ship polished interfaces, and build the infrastructure that powers frontier AI for global enterprises. Location London, UK Why this role is remarkable Direct technical ownership and architectural influence over a platform used by the world's largest financial and technology organizations to make high-stakes decisions.Backed by elite investors including Y Combinator, Point72, and Kindred Capital, alongside industry pioneers from DeepMind and Sequoia Scout.Work at the absolute frontier of AI, turning complex simulation data into high-performance, polished products that deliver value in hours rather than months. What You Will Do Lead the full vertical development of features, from initial scoping and system design to frontend interactions and production deployment.Architect robust data models and API contracts in TypeScript and Python to ensure the simulation engine remains fast and reliable at scale.Partner closely with the CTO and design team to translate complex simulation capabilities into intuitive, high-performance product features with exceptional craft. The ideal candidate 5+ years of software engineering experience with a track record of owning features end-to-end and making critical architectural decisions in production environments.Expert-level proficiency in TypeScript and the modern web stack, with strong skills in Python and advanced PostgreSQL schema design.Exceptional product taste and attention to detail, with a mastery of system performance, API latency, and fluent use of AI coding agents. 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.