Full Stack Engineer - (AI / Autonomous Systems) - San Francisco -Onsite

Benchstack Ai

A venture-backed applied AI lab is hiring a Founding Full-Stack Engineer to build the core systems behind next-generation autonomous agents. This is a 0→1 role for someone who wants to work hands-on with cutting-edge LLMs, multi-agent architectures, and greenfield infrastructure.

What you’ll work on

  • Designing and shipping full-stack systems that power autonomous growth agents — from analysis to content to execution
  • Building backend orchestration layers, event-driven workflows, and scalable data pipelines
  • Developing front-end and generative interfaces that enable agents to run experiments, generate creative assets, and optimise performance
  • Working directly with founders on core architecture, product direction, and technical vision
  • Owning features end-to-end in a product that already has real customers and revenue

We’re looking for

  • 3–5+ years of full-stack engineering (FAANG or top-tier startup experience is great)
  • Deep TypeScript experience across Next.js, React, Node.js, and Postgres
  • Strong systems design skills and comfort with fast iteration cycles
  • Curiosity about AI agents, LLM reasoning, and automated workflows
  • A bias for action and someone who thrives in small, high-velocity teams

Perfect for an engineer who wants extreme ownership, deep technical challenge, and the chance to shape a platform at the earliest stage.

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