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Behavioral and leadership · Coding · System design
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Design a data structure supporting insert(val), remove(val), and getRandom() — which returns a uniformly random existing element — with each operation in average O(1) time…
Companies: Udemy, Amazon, Apple, Bloomberg +7
Array · Design · Hash Table · Math
Last reported Sep 2026
Companies: Udemy, Amazon, Anduril, DoorDash +5
Last reported May 2026
Design a CRM-style sales platform that allows users to manage leads, track sales opportunities through a pipeline, process transactions, and generate sales reports and analytics.
Companies: Udemy
Last reported Feb 2026
Companies: Udemy, Amazon, Arize Ai, Block +12
Last reported Jan 2026
Design an eBay-like e-commerce platform that allows users to view products, manage shopping carts, place orders, complete checkout, and process purchases.
Companies: Udemy, Coupang, eBay, Goldman Sachs +4
Last reported Jan 2026
Companies: Udemy, Amazon, Meta, Netflix +4
Last reported Jan 2026
Companies: Udemy, CrowdStrike, Duolingo, Grab +4
Last reported Jan 2026
Check whether a string of parentheses/brackets is valid by ensuring every closing bracket matches the most recent unmatched opening bracket and the types and nesting…
Companies: Udemy, Amazon, Apple, Bloomberg +9
Bracket Sequences · Stack · String
Last reported Jan 2026