React Native driver app for a logistics startup

We run last-mile delivery across Gauteng and our drivers currently use WhatsApp and paper waybills. We need a proper app. Requirements: • React Native (Expo is fine), Android first — iOS later • Offline-first: a driver in a dead zone must still be able to complete a delivery and sync later • Proof of delivery: photo, signature capture, and a scanned waybill barcode • Route list with sequencing and a handover flow between drivers • Low-data mode — most of our drivers are on prepaid bundles and data cost is a real complaint • Push notifications for new assignments The backend API already exists (REST, documented in Postman). You are building the client and the local sync layer.