Notification Service
mediumOpen designCommonly asked~45 minHLD roundSDE-2 and upAmazonUberSwiggyRazorpayFlipkartQueues & AsyncResilience
The question, as asked
“We need to send notifications — push, SMS, and email — across the company. Design that service.”
Your answer, first
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Worked answer in progress
This one is listed because it comes up constantly — the three-depth answer, follow-ups and red flags are being written. Attempt it above anyway; that part works, and the guides below cover the ground the model answer will.