Full Stack Product Engineer

ZipRecruiter; London; On-site; GBP 100,000 - 200,000; Full time

Job summary

A stealth AI startup in London is seeking a Founding Engineer to join its core team. With an innovative approach to AI integration, the role offers significant involvement in product development and the chance to influence how enterprises utilize AI automation. This position requires strong frontend and backend skills, with a hopeful adaptation to a fast-paced startup environment.

Benefits

Meaningful equity

Flexible start date

Opportunity for deep product involvement

Qualifications

• Experience with frontend frameworks like React and Next.js.
• Proficiency in Python, especially with FastAPI.
• Ability to thrive in fast-paced startup settings.

Responsibilities

• Work on pre-launch tech being used by design partners.
• Build systems that learn from human behavior.
• Contribute to product development and iterations.

Skills

React

Next.js

TypeScript

Python

FastAPI

Job description

Job Description

Founding Engineer – Stealth AI Startup | London | £100–200k

• Location: London (Onsite)
• Compensation: £100,000–£200,000 + meaningful equity
• Start date: Flexible, but ideally soon

I'm hiring for a stealth-stage AI startup founded by two individuals who have worked at some of the biggest names in the space. Backed by deep technical roots and a bold vision, they’re rethinking how enterprises interact with AI, by teaching systems directly through human decision-making.

They are a small team with less than 10 heads, and they're now looking for a founding-level engineer to join the core London team.

Tech stack:

• Frontend: React, Next.js, TypeScript
• Backend: Python, FastAPI

Happy for candidates to lean towards to backend or the frontend

Why this role stands out:

• Stealth-stage, high-impact: You’ll work on tech that’s pre-launch but already being used by early design partners.
• Truly novel approach: Building systems that learn from human behaviour rather than traditional fine-tuning.
• Deep product involvement: Ship fast, iterate constantly, and help define how AI will interface with the enterprise.

If you're a Full Stack Product Engineer who thrives in fast-paced, early-stage environments and you're excited about the future of AI automation — Apply now!!

Founding Engineer – Stealth AI Startup | London | £100–200k