Imagine this:
It's salary day.
It's 2 PM.
Millions of people across India suddenly open their UPI apps and start paying rent, sending money to family, paying credit-card bills, and shopping online.
Now here's the system-design interview question:
Imagine this: It's salary day. It's 2 PM. Millions of people across India suddenly open their UPI...
Imagine this:
It's salary day.
It's 2 PM.
Millions of people across India suddenly open their UPI apps and start paying rent, sending money to family, paying credit-card bills, and shopping online.
Now here's the system-design interview question:

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