Fintech · 14-month engagement
A regional bank's modern payments backbone
Replaced a brittle batch-based payments core with an idempotent, event-sourced backbone. Cut reconciliation from days to seconds.
The challenge
The legacy payments core was an overnight batch system that lost transactions during failures and required manual reconciliation every morning.
Our approach
We designed an event-sourced ledger with idempotent writes, regional failover, and built-in reconciliation. Migration ran in shadow mode for three months before cutover.
The outcome
End-to-end transaction latency dropped to 180 ms. Reconciliation runs automatically. Daily operational overhead reduced by 92%.