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6 questions in the library. A source association does not guarantee a future interview question.
Coding · System design
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Design a real-time messaging system like WhatsApp or Facebook Messenger that supports 1:1 and group conversations, message delivery status tracking, user presence features…
Companies: Airwallex, Addepar, Airbnb, Amazon +22
System Design
Last reported Nov 2026
Contention on scarce inventory: seat holds with TTL, locking/optimistic concurrency, payments, flash-sale traffic and virtual queues.
Companies: Airwallex, Agoda, Amazon, Apple +15
concurrency · idempotency · load-shedding · locking
Last reported Nov 2026
Implement a Tic-Tac-Toe class for an n×n board that supports making moves and immediately reports whether a player wins; the key challenge is designing state…
Companies: Airwallex, Amazon, Databricks, Meta +1
Last reported Oct 2026
Companies: Airwallex
System Design · System Design Fundamentals
Last reported Sep 2026
Date-range inventory: atomic multi-night reservations, expiring holds, stale search results, and payment races.
Companies: Airwallex, Amazon, Booking.com, Carta +10
concurrency · idempotency · inventory-management · payments
Last reported Aug 2026
Companies: Airwallex
System Design · System Design Fundamentals
Last reported Aug 2026