A calendar drawn in KakaoTalk Reservations

KakaoTalk Booking redesigned the seller reservation management view from a card list into a time-block calendar for better readability.

A front-end developer designed an algorithm to place and expand booking blocks using only start and end times.

The implementation used DFS and graph-based logic to handle overlaps, widths, and edge cases in the calendar layout.

The case shows how a practical UI upgrade for high-volume booking services requires both visual design and robust layout logic.