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Home/News/[System Design] Uber RAMEN: How Ride-Hailing Apps Push Real-Time Notifications to Millions of Devices

[System Design] Uber RAMEN: How Ride-Hailing Apps Push Real-Time Notifications to Millions of Devices

The Problem: Pushing Instant Notifications to Millions of Devices Answer-first: Uber's RAMEN system maintains persistent gRPC bidirectional streams to every active driver app. When a match is made, the ride offer travels from the matching engine to the driver's phone in under 100ms โ€” without polling

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