About the Role A fast-moving, seed-stage digital health company is seeking a Founding Engineer (potential CTO) to be the second technical voice on the team. This is a rare 0→1 opportunity to shape the full engineering direction of 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. You'll own the architecture, ship the first end-to-end AI product experience, define the engineering culture, and grow into a CTO role as the company scales. This is a deeply hands-on, in-person role based in New York City, San Francisco, or Montreal.

What You'll Do - 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.

About the Role A fast-moving, seed-stage digital health company is seeking a Founding Engineer (potential CTO) to be the second technical voice on the team. This is a rare 0→1 opportunity to shape the full engineering direction of 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. You'll own the architecture, ship the first end-to-end AI product experience, define the engineering culture, and grow into a CTO role as the company scales. This is a deeply hands-on, in-person role based in New York City, San Francisco, or Montreal.

What You'll Do - 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.