Requirements & estimationHardSDE-2

A request goes through an API gateway, an auth service, an order service, a database and a payment provider, each 99.9% available. What availability does the user get, and how do you improve it?

Asked at

AmazonRazorpay

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

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