System design interview question
"Design a proximity service like Yelp. A user opens the app and sees businesses near them, filtered by category and rating, sorted by distance. 200 million businesses worldwide, 500 million users."
spatial indexing over static objects — deliberately the mirror image of the Uber question. Here the indexed entities barely move, so the read/write asymmetry is reversed and a tree-based index is now appropriate. The best candidates notice this contrast explicitly. The secondary content is combining spatial filtering with attribute filtering and ranking.
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