Google Calendar — Day View

Google Calendar — Day View Frontend / Backend Split: 40% Backend · 60% Frontend Google Calendar Day View is frontend-heavy — but the backend is non-trivial. The frontend solves: virtual scrolling a 24-hour grid, drag-and-drop with snapping, overlapping event layout (interval partitioning), and RRULE expansion. The backend solves: ACID event storage, conflict resolution for concurrent edits, and fan-out notifications to shared calendar members. Both sections get full coverage. 1. Problem + Scope