#websockets

6 websockets interview questions, asked at OpenAI, Anthropic, Meta and 4 more companies. Last asked Oct 2026.

Design a real-time trivia battle royale with live spectatorsSystem designDesign a trivia battle royale. A room holds dozens to a hundred or more players. Questions go out round by round; after each round, players who answered wrong and the slowest…
Last asked Oct 2026
Design a real-time multiplayer typing raceSystem designDesign an online typing race. Each race has 2 to 8 players. When the race starts, every player gets the same generated passage and types it; the first to finish the whole passage…
Last asked Oct 2026
+7
Design a Slack-like chat systemSystem designWorkspaces, channels, threads and direct messages with real-time delivery, unread state, search and history, for large companies.
Last asked Sep 2026
+5
Design Facebook MessengerSystem designOne-to-one and group messaging for a billion users: real-time delivery, offline sync, read receipts and message history on every device.
Last asked Sep 2026
Design live comments for live videosSystem designDesign real-time comments on live video broadcasts: viewers post comments and everyone watching the same video sees them appear within a second or two, even when a popular stream…
Last asked Apr 2026
Design live comments for a live streamSystem designViewers post comments on a live video and everyone watching sees them in near real time, including streams with huge audiences. Cover the write path, fan-out to viewers…
Last asked Jan 2026