01
Challenge
Hevy is one of the highest-rated, fastest workout trackers available — built from the ground up around the logging experience, with a genuinely positive social layer on top. The main delivery challenge was to give users sensitive health information presented calmly, clearly, and without adding cognitive load, while keeping Routine, Log, and Time 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 first separated the core product rules from external services, then defined typed boundaries for every integration. The team delivered Routine, Log, and Time as end-to-end flows, adding retries, idempotent operations, validation, and observable failure states before polishing the interface. This kept third-party behaviour from leaking into the product experience and made later integrations easier to add. The implementation was anchored by React Native, Expo SDK 54, Expo Router, and TypeScript, with shared TypeScript contracts across the frontend and service layer.
03
Delivery
The delivered scope brought Routine, Log, Time, and Analyze into one coherent cross-platform mobile release. The reusable component and data patterns leave a clear route for the next product iteration. For Hevy, the practical result is a product that communicates its value quickly while giving the team a maintainable base for continued delivery in health & wellness.
