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About the Role

An ambitious, well-funded AI startup is seeking its Founding Product Engineer to help build the next generation of AI-powered software from the ground up. This is a 0-to-1 opportunity where you'll work directly with founders to define the product, own technical decisions, and build customer-facing experiences from concept to production. You will have a lasting impact from day one by contributing to product thinking, architecture, customer conversations, and technical strategy while shipping production-ready features at startup speed.

Responsibilities

Build and launch product features end-to-end, from idea to production.
Design scalable APIs and backend systems.
Develop modern frontend experiences using React and TypeScript.
Integrate LLMs and AI agents into production workflows.
Collaborate directly with founders and early customers to shape product direction.
Make key architectural and product decisions.
Continuously improve development velocity using AI-powered engineering workflows.
Help establish the engineering culture and technical foundations of the company.

Requirements

6+ years of full-stack software engineering experience (exceptional candidates with fewer years will also be considered).
Experience building products from 0 to 1 in startup environments.
Hands-on experience integrating LLM APIs (OpenAI, Anthropic, or similar) into production applications.
Strong product intuition with the ability to balance technical excellence and user needs.
High level of ownership and autonomy.
Experience at a high-performing technology company or AI-focused organization.
An impressive portfolio of personal projects, open-source contributions, or startup experience.
Published technical research, conference talks, or notable technical achievements.
Strong architectural thinking and the ability to influence product direction.
Excellent communication skills and the ability to work closely with founders.
Candidates must already have the legal right to work in the UK.

Skills

TypeScript
React
Node.js
Rust
Azure
Docker
RESTful API design
AI agents
Large Language Models (LLMs)
Full-stack application development
OpenAI API integration
Anthropic API integration
LLM API integration

Location

London, United Kingdom

Work Type

On-site
5 days/week
Full-time

Experience Level

6+ years of full-stack software engineering experience

About the Company

This team believes AI is fundamentally changing software development.
The ideal candidate already relies heavily on AI coding assistants such as Claude, Copilot, Cursor, or similar tools as a core part of their engineering workflow—not as an occasional productivity boost.