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About the Role
This is a rare Founding Engineer (potential CTO) opportunity at a seed-stage, AI-native digital health startup focused on nervous system repair and chronic disease management. You'll be the second technical voice at the company, responsible for turning a bold product vision into a production-quality AI mobile experience and defining the engineering culture and stack. You will own the full technical journey, from shipping the first end-to-end AI coaching experience in a React Native app to architecting the model and feedback loop for a real-time nervous system training coach using wearable biosignal data. This role requires in-person collaboration in Montreal, San Francisco, or New York City and is central to the founding team's efforts.
Responsibilities
- Serve as Founding Engineer and potential CTO, owning technical direction and day-to-day execution.
- Ship the AI coaching product v1 end-to-end, from a React Native mobile app to Claude-backed inference and wearable integrations.
- Architect and build an AI-powered nervous system training 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 and maintain AI-powered QA and testing pipelines to enable safe, fast 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).
- Collaborate closely with the founding team on-site in Montreal, SF, or NYC.
Requirements
- Production experience shipping and operating Claude or other frontier LLM-based systems, including prompts, tool use, and evals.
- Willingness and ability to work in-person in Montreal, San Francisco, or New York City.
- 3+ years in mobile/full-stack engineering with a track record of delivering 0→1 consumer mobile apps to real users.
- Deep fluency in React Native with end-to-end ownership of the mobile lifecycle (build, release, debug, monitor, iterate).
- Experience with AI-native infrastructure where AI functions are integrated across all layers.
- Backend development in Node.js or Python with PostgreSQL and modern infra (Vercel, Fly, Render, or similar).
- Ability to move fluidly across the full stack (frontend, backend, infra, AI) with minimal handholding.
- Hands-on experience with HealthKit, wearable APIs, or real-time biosignal data (HRV, PPG, motion).
- Founder mindset: comfortable making hard tradeoffs, operating with high autonomy, and building from zero.
- Experience building AI-powered testing or evaluation pipelines.
- App Store shipping experience with a consumer mobile app with real, active users.
- Background or genuine interest in nervous system science, somatics, neuroscience, or trauma research.
- Prior experience as the first or founding engineer at an early-stage startup.
Skills
- React Native
- AI-native infrastructure
- Node.js
- Python
- PostgreSQL
- Vercel
- Fly
- Render
- HealthKit
- Wearable APIs
- Real-time biosignal data
- Claude
- LLM-based systems
- Prompt engineering
- Tool use
- Evals
- QA and testing pipelines
Location
- Montreal
- San Francisco
- New York City
Work Type
- On-site
- In-person
Experience Level
- Founding Engineer
- 3+ years in mobile/full-stack engineering
- Early-stage startup experience
Salary/Compensations
- $170,000 USD / year
Benefits
- Early-stage equity commensurate with founding-team scope
- High-impact, high-ownership role with a direct path to CTO
About the Company
- Seed-stage, AI-native digital health startup focused on nervous system repair and chronic disease management.