Requirements

Functional Requirements:

• Allow reservation of a parking spot.
• Process payment for the reservation.
• Enable parking of a car in the reserved spot.
• Support early departure before reservation time expires.
• Gate check-in/out.
• Handle no show.

Non-Functional Requirements:

• user authorization and authentication
• integration with third-party payment system
• HA for check-in and check-out
• scaling

API Design

GET /parking/{parking_id}/slots?available=true

POST /parking/{parking_id}/slot/{slot_id}/reserve

POST /reservation/{reservation_id}/pay

POST /reservation/{reservation_id}/confirm

POST /reservation/{reservation_id}/cancel

POST /parking/{parking_id}/check-in/{slot_id}

POST /parking/{parking_id}/check-out/{slot_id}

High-Level Design

Client

Use React framework

Sever

• Use kotlin and spring-boot as base for project
• Postgresql db to store parking, slots, reservation. And to achieve strong consistency.
• Payments should be handled with some third-party SAAS payment provider
• Use Auth0 for user management

Detailed Component Design

Deep dive into 2-3 key components. Explain how they work, how they scale, discuss tradeoffs, capacity, and any relevant algorithms or data structures.