Design a Payments Ledger · System Design Interview

Design a Payments LedgerDesign the store of record for money moving inside a payments company, from which every balance and every statement is derived.What it has to do

Record a transfer as entries against two or more accounts that sum to zero

Report an account’s balance, both now and as it stood at a past moment

Produce a statement of everything that touched an account over a period

Scale

Transfers per day: 500 million

Accounts: 2 billion

Balance reads per day: 5 billion

Out of scope

Card and bank integrations

Fraud checks

Currency conversion and pricing

The customer-facing app

Practise this challengeAll system design challenges

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