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Coding · Practical engineering · System design
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Given an array of bad words and a user-provided string, determine if the string contains any bad words, accounting for common letter substitutions such as…
Companies: Discord
Last reported Sep 2026
Build a real-time chat server that supports core messaging features such as sending and receiving messages, creating and joining chat rooms, and tracking online users.
Companies: Discord
Last reported Sep 2026
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: Discord, Addepar, Airbnb, Airwallex +22
System Design
Last reported Sep 2026
Design a spreadsheet supporting set/get and sum operations where sum formulas can reference individual cells and rectangular ranges; the core challenge is maintaining a…
Companies: Discord, Airbnb
Array · Design · Graph Theory · Hash Table
Last reported Sep 2026
Design a Spreadsheet class with 26 columns and a specified number of rows that supports setCell and resetCell operations and stores integer values (unset cells…
Companies: Discord, Citadel
Array · Design · Hash Table · Matrix
Last reported Sep 2026