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Design a Chat Application
Design a real-time chat application like WhatsApp or Facebook Messenger.
Design a location-based service like Yelp, Uber, or Google Maps Nearby.
We're building a nearby-search service for restaurants. If time permits, we can extend it to moving drivers. How do we efficiently query by location?
Use this as one discussion aid, not a single correct answer. Your design should follow from the requirements, scale, and trade-offs you establish.
graph LR
A["Design Proximity Service"]
A --> F1["Spatial Indexing Geohash vs QuadTree"]
A --> F2["Database Sharding Location-based partitioning"]
A --> F3["Read vs Write Patterns Static Yelp vs Dynamic Uber"]
A --> F4["Accuracy vs Performance trade-offs"]Practice drawing this system component-by-component on a live whiteboard while the interviewer probes at your target level.
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Design a real-time chat application like WhatsApp or Facebook Messenger.
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