Senior AI Orchestration Engineer for React Native / Firebase Fitness Platform

We are building a B2B2C fitness coaching platform used by coaches, clients, and business owners. The app is built with React Native/Expo, TypeScript, Firebase, Cloud Functions, Firestore, Realtime Database, and modern frontend tooling. We are now looking for an individual AI-focused engineer to help design and build the AI orchestration layer of the platform. This role is not just about calling an AI API. We need someone who can help structure how AI works across the product: data collection, prompt pipelines, context building, tool/function calling, agent workflows, response validation, logging, safety, and integration into real product features. This is for an individual developer/engineer only. We are not looking for an agency, team, or company.