Design a Parking Lot
Company: Uber
Role: Software Engineer
Category: Software Engineering Fundamentals
Difficulty: medium
Interview Round: Onsite
In an AI-assisted coding round, design the core object model and APIs for a parking lot system.
The system should support:
- multiple floors
- multiple spot types
- vehicle types such as motorcycle, car, and truck
- assigning a valid spot when a vehicle enters
- issuing a parking ticket on entry
- releasing the spot when the vehicle exits
- calculating parking fees based on duration
- querying current availability
Explain the main classes, relationships, key methods, and how you would handle concurrent vehicle entry so that two vehicles cannot claim the same spot.
Quick Answer: This question evaluates proficiency in object-oriented modeling, API design, concurrent resource allocation, state management, and billing logic for a transactional parking system.