Full-Stack AI Mobile Engineer

Our client is looking for a Full-Stack AI Mobile Engineer to join as their Founding Engineer, with the opportunity to grow into a Founding CTO role over time.

This is not a traditional engineering position. You’ll be the second technical voice in the room - the person responsible for turning ambitious product ideas into reality while helping define how the company builds for the next decade.

The ideal candidate is deeply technical, product-minded, AI-native, and thrives in fast-moving startup environments.

· You’re fluent in React Native and comfortable owning the full mobile lifecycle: build, release, debug, monitor, iterate.

· You’ve built with Claude (or other frontier models) in production - prompts, tool use, evals, the works.

· You can move across the stack - frontend, backend, infra, AI - and you don’t flinch.

· You’ve worked or can learn HealthKit, sensor data, or wearable APIs and you understand how messy biosignals actually are.

· You’re a founder, in your bones. You don’t need a ticket to start working. You see a gap and close it.

Bonus points

· Background or deep interest in nervous system science, somatics, neuroscience, or trauma research.

· You’ve been the first engineer somewhere before - and you know what that actually costs.

· You’ve built AI-powered testing or eval pipelines and have strong opinions about them.

AI-native at every layer.

· React Native (iOS-first, Android close behind)

· Claude-based architecture - agentic workflows, tool use, structured outputs

· AI-powered QA testing (think: agents that test agents)

· IOS / HealthKit + wearable integrations - HRV, Apple Watch, Oura, Whoop, EEG headbands

· Backend: Node or Python, Postgres, modern infra (Vercel / Fly / Render - your call)

· AI-native infrastructure - every layer of the stack is a place where AI lives, not a place where AI is bolted on