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Core product & engineering · Founding role

Full-Stack Engineer (AI · systems · data · UX-first)

Rockstar full-stack engineers who are AI-, systems-, data-, and user-experience-first - all at once.

Office-first9 cities

About the role

You build the product people actually touch, across the whole stack, on a team small enough that the thing you ship on Tuesday is in front of users by Friday. This is AI-first work in the literal sense: the agent runtime, the data underneath it, and the interface on top are one problem, and you will work on all three rather than being handed a slice.

What you’ll do

  • Build Agent One features end to end - from data and agent runtime to a UX that feels inevitable
  • Make AI a first-class material: tools, memory, evals, and the consent layer underneath
  • Design data systems that are fast, private, and correct - receipts, least privilege, minimal disclosure
  • Obsess over latency, accuracy, and control; instrument outcomes so we don't fool ourselves
  • Write small, modular, legible code others could lift on its own

What we need to see

  • You have shipped and owned production full-stack work, front to back, for real users
  • Hands-on LLM and agent work: tool use, context handling, and the evals that keep it honest
  • Taste in interface, not just capability: you can tell when something is technically correct and still bad
  • You debug across boundaries rather than escalating at the edge of your usual layer

Nice to have

  • On-device or edge inference experience, since much of our compute is on hardware the user owns
  • You have worked somewhere with a real privacy or consent constraint, not just a policy page
  • Open-source work anyone can read

What winning looks like

  • Features shipped that move activation and weekly-active retention
  • Latency, accuracy, and quality budgets met
  • Code others reuse; low defect and regression rate

Where and how we work

In the office together five days a week, in any of these cities. Remote-friendly around your family, arranged one person at a time.