Founding Senior Full-Stack Engineer – Agentic AI

Jack & Jill is seeking a founding Senior Full-Stack Engineer to join a stealth-stage AI startup in London or San Francisco. You will architect a real-time, multiplayer agent system that coordinates work across teams, bridging LLM workflows with high-performance front-end engineering.

You will own end-to-end development, integrate with Slack, Notion, and Linear, and optimize front-end performance while scaling backend graphs and AI processes.

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