Founding Product Platform Engineer | Equity & AI Infra

Jack & Jill; Greater London; On-site; GBP 90,000 - 130,000; Full time

Job summary

Jack & Jill in London is seeking a Founding Product Platform Engineer to design the auditable AI decision platform infrastructure. You will own the engineering craft across backend APIs, frontend interfaces, and data-heavy systems to make complex reasoning transparent to customers.

Join a founding team at a well-funded AI startup, shape core architecture, and bridge cutting-edge AI research with reliable, user-centric software.

Qualifications

• 5+ years of software engineering experience.
• Strong proficiency in Python (FastAPI) and React/TypeScript (Next.js).
• Proven track record of building data-intensive B2B SaaS platforms or complex workflow tools.

Responsibilities

• 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.

Skills

Python

React

TypeScript

FastAPI

Tools

Next.js

Job description

Jack & Jill in London is seeking a Founding Product Platform Engineer to design the auditable AI decision platform infrastructure. You will own the engineering craft across backend APIs, frontend interfaces, and data-heavy systems to make complex reasoning transparent to customers.

Join a founding team at a well-funded AI startup, shape core architecture, and bridge cutting-edge AI research with reliable, user-centric software.