Artificial Intelligence Engineer

AI Engineer \| YC-Backed Startup \| $10M\+ Seed \| London \| Up to £165,000 \+ Equity

The Opportunity

A YC-backed startup is building an AI-native platform that's transforming a massive, slow-moving industry. They're automating complex workflows that currently take weeks down to minutes using intelligent agents and LLM-powered systems.

They've recently closed a significant seed round and are experiencing rapid growth. This role would see you joining their engineering team working on-site in London, building the core AI infrastructure that powers their platform.

What You'll Do

• Build production AI systems from scratch – agentic workflows, RAG pipelines, and LLM-powered automation
• Design and implement multi-agent systems that handle complex business workflows autonomously
• Own the AI stack end-to-end – from prompt engineering and guardrails to deployment and monitoring
• Work directly with founders to translate business problems into AI solutions
• Ship features fast, iterate based on real user feedback, and scale systems processing thousands of transactions

What They're Looking For

• Strong production experience with LLMs (fine-tuning, RAG, prompt engineering, agentic systems)
• Backend engineering skills (Python, FastAPI, TypeScript) – you can build the infrastructure, not just call APIs
• Shipped AI systems to production (not just prototypes or side projects)
• Comfortable with ambiguity and rapid iteration – this is zero-to-one building
• Excited about solving real problems for real users, not just cool tech for tech's sake

Tech Stack

Python, TypeScript, LLMs (Claude, OpenAI, Gemini), RAG, Vector DBs (Pinecone), FastAPI, Next.js, PostgreSQL, GCP

What's on Offer

• Founding engineer equity – join early, own a meaningful stake
• Competitive salary for early-stage startup
• Work directly with YC-backed founders who've built and exited before
• On-site in Central London – high-intensity, high-velocity environment
• Shape the AI infrastructure of a rapidly scaling company

The Culture

This is a "hire and ship" team. They work on-site, move fast, and care deeply about building products that genuinely help people. If you want endless meetings and slow iteration, this isn't the place. If you want to build AI systems that matter and scale fast, get in touch.