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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.