Founding Engineer (Python, LLMs, TypeScript) Salary up to £250k Equity London based onsite Build the Future of AI Voice Top VC backed Series A Startup, building AI voice agents that transform how trades businesses operate, from handling customer interactions to streamlining operations at scale. As a founding engineer, you wont just ship features; youll shape the product, define the architecture, and play a key role in how AI interacts with real-world customers every day. Roles like this are rare: high ownership, direct customer impact, and the chance to build something foundational from the ground up, a hallmark of early-stage AI startup. What Youll Do Build and ship core product features across a modern stack (Python, TypeScript, cloud, event-driven systems) Own problems end-to-end from customer discovery through to production deployment Work directly with users to turn messy, real-world workflows into elegant AI-powered solutions Balance speed vs scalability, knowing when to prototype and when to harden systems Set the standard for engineering excellence across reliability, testing, and security What You Bring Experience 5-10 years in full-stack engineering (backend-leaning) Proven track record building and shipping AI products end-to-end — especially agentic systems Experience in early-stage startups (or founder-level ownership mindset) Bonus: direct experience working with customers Technical Strong Python or TypeScript skills (async Python is essential) Hands-on experience with LLMs and modern AI tooling Deep understanding of: async/await, coroutines httpx, AsyncOpenAI production-grade error handling in async systems Experience with cloud infrastructure (Kubernetes, serverless, distributed systems) Mindset You move fast and take ownership Youre comfortable with ambiguity and building from first principles You care about shipping real products — not just prototypes If youre excited by the idea of building foundational AI products from scratch, and want your work to directly shape what gets built, this is that opportunity!