Payments & fintechMediumSDE-3

You are designing the ledger for a payments company expecting 50 million transactions a day. Would you use Postgres, Cassandra, or something else? Justify the choice.

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PhonePeRazorpayZerodha

Think first

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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