Amazon Interview Question: Design a Delayed Job Scheduler (Timers, Leases, and Exactly-Once Execution)

This story is from 2026-09-23. It is preserved in the archive; the latest stories are on the live feed.

Every candidate can write the first version of this in about thirty seconds. new Thread(() -> { Thread.sleep(delayMillis); runJob(job); }).start(); That code is correct in the narrowest possible sense. It also falls over at roughly 10,000 jobs, forgets everything the moment the process restarts, an…

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1. 2026-09-23 03:31 · DEV Community — AI
   Amazon Interview Question: Design a Delayed Job Scheduler (Timers, Leases, and Exactly-Once Execution)