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Messaging & event-driven designEasySDE-1

OTP SMS and marketing SMS go through the same queue. During a marketing campaign of 50 lakh messages, users wait 20 minutes for OTPs. How do you fix it?

Asked at
PaytmPhonePePolicyBazaarSwiggy

Think first

Answer out loud as you would in the room — clarify, give numbers, name the trade-off — then compare with the model answer.

Go deeper

Design an OTP service at scale Lesson: Message queues & async processing

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