TL;DR — Airbnb

Design a vacation rental marketplace similar to Airbnb where hosts list properties and guests search, book, and pay for stays. The system must handle complex availability calendars, date-range search across millions of listings, dynamic pricing that varies by season and demand, and a booking flow that prevents double-bookings on the same dates. Key features: Hosts create listings with photos, amenities, house rules, and pricing. Guests search by location, dates, guests count, price range, and amenities.