Senior Fullstack Product Engineer

Foundation Partners; Greater London; Hybrid; GBP 120,000 - 150,000; Full time

Benefits offered by this job

Equity

Job summary

Foundation Partners is hiring a Senior Product Engineer in London. You’ll own the front-end interfaces (React/TypeScript) that scientists use to interact with our AI-powered platform, with backend services in Python and Java.

The role is hybrid, requiring 2–3 days onsite in London, with a fast-moving team and high ownership in a stealth startup environment. You will help shape frontend architecture, supplier provenance and confidence features, and closely collaborate with founders and domain

Qualifications

• 4+ years engineering experience with React/TypeScript and full-stack backend (Python/Java).
• Shipped product experiences with strong product sense and attention to detail.
• Experience shipping AI-powered features is a plus.

Responsibilities

• Own the product surfaces where scientists interact with the platform from end-to-end to production.
• Contribute to frontend architecture and component systems to ship polished features quickly.
• Collaborate closely with founders, customers, and domain experts to turn ambiguity into shipped product.

Skills

React

TypeScript

Python

Java

Tools

Frontend

Backend

Job description

Our client is a well-funded stealth startup within the Life Science are and are building the groundbreaking AI operating system for drug discovery software.

They’re hiring a Senior Product Engineer to own the interfaces where scientists interact with the platform. The stack is React and TypeScript on the front end, with Java and Python services behind it. You’ll live mostly in the front end and API layers, with the range to go deeper when the product demands it.

Salary: £120,000-£150,000 + equity

Location: London - Hybrid 2-3 days a week onsite

What You’ll Own

• The product surfaces where scientists interact with the platform, end-to-end through to production
• Trust surfaces (provenance, citations, confidence) rendered so a scientist can check the work behind any answer
• The component systems and frontend architecture that let a small team ship polished product quickly
• Close work with founders, customers, and domain experts, turning ambiguity into shipped product

What They’re Looking For

• 4+ years of engineering experience, with deep React/TypeScript expertise and solid full-stack range with experience with Python/Java on the backend.
• You’ve shipped product experiences people rely on, and you can point to them and a strong product taste .... you sweat interaction details, performance, and polish
• A background that held a high bar: FAANG, a top AI lab, or a startup/scale-up with a great product engineering function
• Nice to have: genuine curiosity about building with AI, or experience shipping AI-powered features

This is a high-ownership role at a company of roughly a dozen people and it is fast-moving, direct, and high-stakes, with responsibility that will outrun your title.