Mobile Apps · Pakistan / Middle East
Caber
Passenger-proposed fare bids (no surge pricing), live Google Maps polylines, a 5-minute arrival grace counter with driver overtime compensation, offline itinerary cache, and a 5–20km driver search radius.
The challenge
Sub-second fare negotiation and live location polling without draining batteries or dropping sockets.
The solution
A Flutter BLoC event architecture over duplex WebSockets with adaptive exponential-backoff reconnection.
Outcomes
- 4.9★ store rating
- Zero lost bids at peak load
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