Your question is Design a Location-Based Service. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Design a location-based service like Yelp (database choice, schema, SQL vs NoSQL, API layer, scaling, load balancing), then deep dive into the geospatial index. Asked in the system design screener stage, with architecting Yelp or Twitter at scale as the expected bar. The interviewer then focused on the spatial index, including optimal space partitioning and the time complexity of R-tree versus quadtree solutions.