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Behavioral and leadership · Coding · System design
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Design a notification system that can handle large-scale marketing campaigns for enterprises, supporting features like message targeting, delivery scheduling, and campaign…
Companies: Trustpilot, Amazon, Clevertap, Microsoft
Last reported Nov 2025
Companies: Trustpilot, Amazon, Anduril, DoorDash +5
Last reported Nov 2025
Count the number of islands (4-directionally connected components of '1's) in an m×n binary grid. This is a connected-components/flood-fill problem typically solved with…
Companies: Trustpilot, Amazon, Anduril, Apple +16
Array · Breadth-First Search · Depth-First Search · Matrix
Last reported Nov 2025
Companies: Trustpilot, Amazon, Oracle
Last reported Nov 2025
Companies: Trustpilot, Adyen, Airbnb, Amazon +31
Last reported Nov 2025