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About the Role

A seed-stage digital health company seeks a Founding Engineer (potential CTO) to be the second technical team member. This role involves shaping the engineering direction of an AI-native mobile health platform focused on improving autonomic nervous system health through biosignal data and real-time coaching. The engineer will own architecture, launch the first AI product, define engineering culture, and grow into a CTO role.

Responsibilities

Serve as the founding engineer and de facto technical leader, owning both direction and execution.
Ship the v1 AI coaching experience end-to-end, from a React Native mobile app to frontier-model-backed inference and wearable integrations.
Architect and build the nervous system training AI coach, including model design, prompt engineering, tool use, and evaluation pipelines.
Translate biosignals (HRV, breath, motion, PPG) into a real-time, personalized coaching layer.
Build AI-powered QA and testing pipelines to enable safe, rapid daily shipping.
Own full-stack decisions across frontend, backend, infrastructure, and AI-native layers.
Integrate iOS/HealthKit and wearable platforms (e.g., Apple Watch, Oura, Whoop, EEG headbands).
Define and uphold engineering standards and culture as the team grows.

Requirements

Proven experience shipping and operating Claude or other frontier LLMs in production (prompts, tool use, evals).
Ability and willingness to work in-person in New York, San Francisco, or Montreal.
3+ years in mobile/full-stack engineering with demonstrated 0→1 consumer mobile app delivery to real users.
Fluency in React Native with full ownership of the mobile lifecycle (build, release, debug, monitor, iterate).
Experience with AI-native infrastructure where AI is integrated across layers, not bolted on.
Backend development in Node.js or Python with PostgreSQL and modern infra (Vercel, Fly, Render, or similar).
Comfortable moving across frontend, backend, infra, and AI layers with minimal handholding.
Experience with HealthKit, wearable APIs, or biosignal data (HRV, PPG, motion) in real-time contexts.
Founder mindset with prior first-engineer or early-stage startup experience and the ability to make hard tradeoffs.
Experience building AI-powered testing or evaluation pipelines.
Background or deep interest in nervous system science, somatics, neuroscience, or trauma research.
Prior experience as the first engineer at a startup.

Skills

React Native
Node.js
Python
PostgreSQL
Vercel
Fly
Render
HealthKit
Wearable APIs
Biosignal data (HRV, PPG, motion)
AI-native infrastructure
LLMs (Claude)
Prompt engineering
Tool use
Evaluation pipelines
AI-powered testing

Location

New York City, NY
San Francisco, CA
Montreal, Canada

Work Type

On-site
In-person

Experience Level

3+ years in mobile/full-stack engineering
Early-stage startup experience
First-engineer experience

Salary/Compensations

$170,000

Benefits

Meaningful early-stage equity offered (range up to $2M in potential value)
Opportunity to grow into a CTO title as the company scales

About the Company

A fast-moving, seed-stage digital health company.
Developing an AI-native mobile health platform that uses biosignal data and real-time coaching to help people manage chronic symptoms by improving autonomic nervous system health.