Inside the MondialPay ledger: how we store money
Every balance, every transfer, every reconciliation row. Here's how we designed the ledger that powers billions in daily volume.
A payments company is, at its core, a ledger. Get the ledger wrong and everything downstream — reporting, reconciliation, auditing — is broken. This post walks through how we designed ours.
Double-entry, append-only, partitioned by account, with per-row cryptographic signatures. It's boring on purpose.
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#Engineering