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Fintech Core Platform
Rebuilding a banking core phase by phase — accounts, transfers, ledger, and events with open source NestJS code and articles that explain why, not just how.
6 articles
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Series
Rebuilding a banking core phase by phase — accounts, transfers, ledger, and events with open source NestJS code and articles that explain why, not just how.
6 articles
Latest in this series
Who else needs to know once the money has already moved? I asked myself that with the ledger freshly done and no topic running yet. That week I split what happened in the domain from the message Kafka will carry next.
A LinkedIn post on fintech architecture, a recent technical challenge, and a decision to rebuild a banking core from scratch — slower this time, to actually learn.
Three seconds on the spinner. Timeout on screen. Did the money move? I reopened my Arkano challenge next to a fintech architecture map — and understood why POST /transfer was never just an endpoint.
Six boxes on the diagram. Six microservice temptations. I almost fell for it again — until I got that the full map doesn't mean shipping it all in week one, and splitting repos doesn't split the domain
What happens when money stops being a number and becomes a responsibility? I asked myself that looking at amountCents in my POST /transfer draft. That day I wrote Money.
How do you prove the money moved if the client retries after a timeout? I asked myself that while picturing a balance column and an UPDATE again. That week I wrote movements you never delete