Founding Full Stack AI Engineer

Location: London (Hybrid) Stage: Early-stage startup Reporting to: Founder / CPO Salary: £75,000 - £90,000 Equity: Meaningful early-stage equity available About us Currently in stealth building an agentic AI & intelligence platform for sustainability action and decision-making. What we’re looking for Essential Strong software engineering fundamentals 7+ years building full-stack applications Proficiency in modern web technologies - ideally in React/Next.js/TypeScript Experience with backend development using Python Comfort working with messy, real-world data Clear communicator who can explain complex systems and concepts Use of coding agents to accelerate work (Codex/Claude Code) Strong plus Experience building agentic workflows that are trusted Experience with LangChain, LangGraph, or similar Experience building with vector databases and RAG Experience with graph databases Experience building decision-support systems Prior startup or early-stage experience Why join us Work on problems that actually matter - climate, nature, social Build cutting-edge agentic systems Strong influence in early key decisions Meaningful equity at an early sta...