Founding Product Platform Engineer (+ Equity) at well-funded AI decision startup

Job Title

Founding Product Platform Engineer

Salary

Not Disclosed + Equity

Company Description

Well-funded AI decision startup

Job Description

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.

Location

London, UK

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.

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.

The ideal candidate

• 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.