Proximity service (Yelp nearby)

Find businesses near a location. The data barely changes and the queries are heavily concentrated on dense areas, so the design is a read-optimised geo index — geohash, quadtree or S2/H3 cells — replicated and cached, fed asynchronously from the source of truth.

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Duration 45:00

Requirements checklist

Search businesses within a radius of a point, optionally filtered by category.View business details.Owners add or update businesses; changes may take minutes to appear in search.Search p99 under ~100 ms.Read-heavy: ~5,000 searches/s against a few updates per second.Highly available reads; eventual consistency for updates is acceptable.

Clarifying questions

Maximum search radius?
Number of businesses and growth?
How fast must updates appear in search?
Filters and ranking needed?

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requirements

Suggested time: about 6 minutes. Separates search freshness from detail freshness.

Notes for requirements