Cross-Border Health & Clinic Cold-Chain Logistics Platform
Intermittent 2G cellular coverage across 400+ remote mountain clinics created deep data blind spots. Immunization registries suffered severe sync collisions, vaccine stockouts, and refrigerated cold-chain failure risks due to 72-hour grid blackouts.
Engineered an offline-first PWA coupled with an embedded SQLite transactional queue and delta synchronization engine. When edge workers regain signal, encrypted delta packets transmit over lightweight gRPC and MQTT channels to high-availability Go services hosted in AWS Cape Town (af-south-1), reconciling into a CouchDB cluster with deterministic vector clocks.