Founding Product Platform 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 Founding Product Platform Engineer Salary Not Disclosed + Equity Company Description OpenHuman is a London-based AI company building a decision platform that enables organizations to simulate and audit how markets, competitors, and customers respond to high-stakes decisions before they go live. Job Description As a founding engineer, you will build the product layer that makes OpenHuman's complex AI reasoning usable and repeatable. You will design systems for data ingestion, workflow execution, and evidence auditing, turning raw AI prototypes into a polished B2B platform. This role bridges the gap between high-touch technical work and scalable software. Location London, UK Why this role is remarkable Founding-level ownership at an early-stage company where you define the engineering standards, architecture, and core product culture.Directly solve the "black box" AI problem by building interfaces and infrastructure that make messy data and uncertain predictions completely inspectable and trustworthy.Work alongside expert founders to turn innovative AI reasoning workflows into a repeatable, high-impact platform for global enterprise decision-makers. What You Will Do Build the core product using Python (FastAPI) and React (Next.js/TypeScript), architecting the systems that manage customer workspaces and data ingestion.Design and implement customer-facing interfaces that allow users to query, explore, and audit AI-generated insights with clear evidence provenance.Collaborate with AI engineers to productize complex reasoning workflows, ensuring high reliability, observability, and security foundations from day one. The ideal candidate Has 5+ years of software engineering experience with a strong mix of backend systems (Python) and frontend product craft (React/TypeScript).Demonstrates deep expertise in building data-intensive B2B SaaS products involving complex workflows, artifact versioning, and high-reliability data modeling.Possesses a bias toward ownership in ambiguous environments and the product judgment to make complex analytical systems feel intuitive and reliable. 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.