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Founding Engineer at Quest AI

Jack and Jill AI

Founding Engineer

You will join as a founding engineer to build a proactive AI mentor that understands users deeply through digital footprints. This role involves solving complex problems in psychological profiling, memory architecture, and adaptive interfaces. You will work directly with repeat founders in San Francisco to ship a generational product that pushes human growth.

Location: San Francisco, USA

Why this role is remarkable:

  • Work directly with repeat founders who previously led AI agent teams at Google and successfully exited their first startup.
  • Tackle unsolved technical challenges like long-term compounding AI memory and proactive agentic behavior beyond simple chatbots.
  • Join a small, elite team with high ownership, offering significant equity and the chance to define a new category of consumer technology.

What you will do:

  • Architect a sophisticated memory system that uses digital footprints to build deep psychological profiles of users.
  • Design and implement a morphing UI that personalizes the entire interface experience based on individual user needs and behaviors.
  • Build and maintain robust evaluation frameworks to measure real-world behavior change and ensure the AI provides meaningful mentorship.

The ideal candidate:

  • A strong generalist engineer who has a proven track record of shipping production-ready systems and finishing complex side projects.
  • Experience building with LLMs and agents, with a deep understanding of memory orchestration, tool use, and reliable AI behavior.
  • A product-minded, autonomous builder who thrives in fast-paced environments and is excited to use AI tools to accelerate their own workflow.
Vacancy posted 12 hours ago
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