Join a founding team building an auditable AI decision platform. You will design the product infrastructure that makes complex reasoning, evidence, and uncertainty visible to customers. This role bridges the gap between raw AI workflows and scalable B2B software, owning the engineering craft across backend APIs, frontend interfaces, and data-heavy systems.
Founding Product Platform Engineer at well-funded AI decision startup
Are you a product-minded engineer ready to build the platform layer for a new kind of AI company? Join a London-based founding team building an auditable decision platform where you will design systems that make complex reasoning traceable and trustworthy, bridging the gap between raw AI workflows and scalable B2B software in a high-impact role backed by top-tier VCs. This founding position offers you the unique opportunity to shape core architecture and product culture from day one, working directly with founders to turn messy data and uncertain predictions into coherent, reliable insights that drive high-stakes business decisions.
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Location
London, United Kingdom
Compensation
Not Disclosed + Equity
Company
Confidential company
Role overview
About the company
Well-funded AI decision startup
What you will do
- Build the core product platform including customer-facing interfaces, backend APIs, and reusable data workflow systems.
- Design and implement infrastructure for storing, querying, and auditing AI-generated insights, source evidence, and model traces.
- Collaborate with founders to transform prototype AI workflows into robust, repeatable software primitives that ensure customer trust.
Who this is a fit for
- 5+ years of software engineering experience with strong proficiency in Python (FastAPI) and React/TypeScript (Next.js).
- Proven track record of building data-intensive B2B SaaS platforms or complex workflow tools from the ground up.
- Exceptional product judgment with a focus on creating clear, reliable, and observable systems in ambiguous environments.
Why this role is remarkable
- Shape the core architecture and product culture of a venture-backed startup at the founding stage.
- Solve unique technical challenges in making non-deterministic AI outputs auditable, traceable, and trustworthy for high-stakes business decisions.
- Direct ownership over the platform layer that bridges cutting-edge AI research with reliable, user-centric software products.
How Jack & Jill work together
I get to know what you’re great at, then find roles you’d never find yourself.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.
I recruit from Jack’s network and make the intro when I spot a great match.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.
Jack gets to know what you're great at and what you want next, then searches 15 million jobs daily and helps you discover roles at companies like this.
Meet Jack
What happens next?
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 your profile’s a match and Confidential company wants to meet, Jill will make the intro. In the meantime, Jack will send you excellent alternatives.