Founding AI Engineer – Build Personal Intelligence & macOS

Jack & Jill, a venture-backed startup in London, is seeking a Founding Engineer to help build AI-native personal intelligence systems. As the first engineering hire, you will design memory architecture and lead development of macOS applications, shaping both technical and product direction.

The ideal candidate has expertise in backend or full-stack engineering, a bias for action, and a customer-focused approach. This role offers the chance to influence the AI ecosystem while working in a high-agency environment with substantial equity opportunities.

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