FitPulse App

The Challenge

The client, a digital fitness brand, launched an application providing interactive video training plans. However, users faced high disconnect rates when using the app inside gyms or outdoor environments with poor cell coverage, terminating session logs and resetting timers.

Furthermore, the client's existing backend server was overwhelmed by synchronization requests made at the exact same hour daily (e.g. 8:00 AM post-workout peaks), crashing endpoints. The client required a local-first mobile design that kept logs active offline and synced data smoothly when a connection was established.

The Solution

Ankur Weldtech India designed and developed a local-first mobile fitness application using React Native, Redux, and an offline-enabled SQLite caching layer. The workout timers and activity trackers run locally inside a Redux state machine, caching session records to SQLite instantly without depending on network availability.

To synchronize cached logs, we built a Node.js sync API that supports optimistic offline updates and queue-based merging. When the device connects to the internet, it sends a compressed event batch to the backend. The Node.js API processes the logs and resolves discrepancies asynchronously, protecting server bandwidth.

Key Results

With FitPulse App, the brand successfully resolved workout interruption complaints, boosting app store reviews. The queue-based synchronization resolved database load spikes, providing a highly scalable platform for international expansions.