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Design a Booking System Feature: Auxiliary Comments
Design an object-oriented model and a high-level system architecture for a new feature within a booking system that allows storing auxiliary comments on reservations.
Core Requirements
- Each reservation or booking can have an auxiliary comment (e.g., “quiet room please”, “late check-in”).
- Regular users must be able to add or edit the auxiliary comment for their own reservations.
- Admins must be able to update the auxiliary comment for any reservation.
Extension
- Admins may need to batch update auxiliary comments across a large number of reservations (e.g., applying a policy note to thousands of bookings). Detail how you would design this batch update mechanism.
Clarifications to Consider (State Assumptions)
- Is there one comment field per reservation, or a list/history of comments?
- Do we need auditability (who changed it and when)?
- What are the expected scale metrics (number of reservations, frequency of updates, typical batch size for admin operations)?
AI interview prep
Core dilemma
Balancing the simplicity of a single comment field with the need for auditability, versioning, and handling concurrent updates (user vs. admin, single vs. batch) efficiently and scalably.
Mid-level signals3
Senior signals3
Red flags3
3 tradeoffs and 3 stress tests locked
Interview prep
Unlock the interviewer X-Ray rubric, tradeoff matrix, stress tests, clarifying questions, and key concepts.
Design a Booking System Feature: Auxiliary Comments
Design an object-oriented model and a high-level system architecture for a new feature within a booking system that allows storing auxiliary comments on reservations.
Core Requirements
- Each reservation or booking can have an auxiliary comment (e.g., “quiet room please”, “late check-in”).
- Regular users must be able to add or edit the auxiliary comment for their own reservations.
- Admins must be able to update the auxiliary comment for any reservation.
Extension
- Admins may need to batch update auxiliary comments across a large number of reservations (e.g., applying a policy note to thousands of bookings). Detail how you would design this batch update mechanism.
Clarifications to Consider (State Assumptions)
- Is there one comment field per reservation, or a list/history of comments?
- Do we need auditability (who changed it and when)?
- What are the expected scale metrics (number of reservations, frequency of updates, typical batch size for admin operations)?