Prep RoomSign inStart free
Code RoomShared-ride matching
HardPrep Room Coding #3276

Shared-ride matching

System designDistributed systemsSenior–Staff~50 min

Design the shared-ride (carpool/pool) matching service that combines multiple riders going in similar directions into one vehicle in real time: a new request must be matched to an in-progress or forming trip within seconds such that the added detour for existing riders stays under a bound and total vehicle occupancy and routing stay feasible. 10k pool requests/second in dense metros. Cover candidate generation, the matching decision, and the detour/feasibility trade-off.

What a strong answer looks like

Clarify scale and constraints first. Propose a clean component breakdown, then go deep on the hard parts (data model, bottlenecks, consistency, failure modes) and name the trade-offs you are making.

Clarify5:30 left
Estimate5:30 planned
Design16:30 planned
Deep dive13:30 planned
Failure9:00 planned
0:00
Which questions mattered is sealed until you submit. Telling you now would just be handing over the edge cases.