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Companies / Paypay

Paypay interview questions

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System design

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System designHard
Design a digital wallet like Venmo
Stored balances and peer-to-peer transfers: concurrent debits, retries with the same request key, and recovery without lost money.
Companies: Paypay, Revolut
concurrency · durability · idempotency · ledger
Last reported Aug 2026
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System designDifficulty not specified
Design a Payment Processing System with Credit Points Distribution
Design a payment processing system that distributes credit points from 4 different payment sources, determines priority among them, and orchestrates the payment execution…
Companies: Paypay
Last reported Jul 2026
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