Architecture & LLD Preview
Hotel Reservation
Search rooms by date range and type, hold and confirm reservations, and handle availability over time.
Availability over time via a half-open DateRange with an overlaps() predicate, reservations per room, an atomic find-then-hold, pluggable nightly pricing, and a HELD → CONFIRMED lifecycle.
Core Design Challenge
"Design a hotel reservation system — search rooms by type over a date range, book/confirm, and never double-book a room for overlapping dates."
What You'll Learn:
- ✦Preventing double-booking using concurrency control
- ✦Modeling reservation states (Pending, Reserved, Paid, Cancelled)
- ✦Designing database schemas (User, Show, Seat, Booking)
- ✦Scaling seat allocation under high concurrent user load