TL;DR — Proximity/Nearby Service

Design a proximity service like Yelp's nearby search or Google's 'restaurants near me' that returns businesses or points of interest within a given radius of the user's location. The system must handle millions of queries per day, each requiring a spatial search across a dataset of hundreds of millions of locations. Key features: Search nearby businesses by category within a radius. Return results sorted by distance, rating, or relevance.