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3 questions in the library. A source association does not guarantee a future interview question.
Behavioral and leadership · Coding · System design
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Async processing with durable queues, per-channel isolation, retries/DLQ, at-least-once + idempotency, outbox, priorities.
Companies: Duolingo, Airbnb, Amazon, Autodesk +24
async-processing · idempotency · outbox-pattern · queues
Last reported Apr 2026
Companies: Duolingo, CrowdStrike, Grab, Meta +4
Last reported Apr 2026
Implement an Encrypter that maps each character to a two-letter code and supports encrypting by replacing characters and decrypting by counting how many dictionary words…
Companies: Duolingo
Array · Design · Hash Table · String