01
Challenge
Guava aggregates records from 50,000+ US providers — via MyChart, Cerner and others — into one personal health record. The main delivery challenge was to give users sensitive health information presented calmly, clearly, and without adding cognitive load, while keeping Import, Organize, and Search consistent across the complete journey. We framed the engagement around the smallest production-worthy flow first, then expanded the scope without weakening the underlying component and data model.
02
How we built it
We began by mapping the user journey and the boundaries of the AI: what context it receives, what it may return, and where deterministic application logic must stay in control. We then built Import, Organize, and Search as small end-to-end slices, connecting the interface to the data and model layers early so the team could test real responses instead of static mock-ups. Prompt, validation, and fallback behaviour were refined alongside the product UI. The main implementation used React Native, Expo SDK 54, Expo Router, and TypeScript, with typed contracts keeping the JavaScript stack consistent across the product.
03
Delivery
The delivered scope brought Import, Organize, Search, and Trend into one coherent cross-platform mobile release. Model output, product logic, and user feedback are separated clearly, which makes the AI easier to evaluate and evolve. For Guava, the practical result is a product that communicates its value quickly while giving the team a maintainable base for continued delivery in health & wellness.
