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How NestJS Reconciliation Services Keep Ledger and Bank Records in Sync

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Financial systems can silently drift out of sync with bank records over time, even when no explicit bug is present — a problem that standard transaction ingestion logic does not address. Reconciliation is a separate scheduled process designed to periodically compare internal ledger entries against bank statements and flag any discrepancies. Common mismatches include transactions recorded as pending but never resolved, refunds processed at the bank without notifying the system, and silent batch-pull failures affecting individual accounts. A NestJS implementation can handle this by mapping ledger entries against bank records by reference ID and saving typed flags for missing or mismatched entries, without auto-correcting either side. Keeping reconciliation as a read-and-flag-only process ensures that mismatches are reviewed deliberately, since the root cause may lie with either the internal system or the bank's data.

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