// Hacker Noon · 24 March 2026

The State Machine That Saved a National Payment System (and What I Learned Building It)

When building the settlement engine for a national Instant Payment System, we hit the limits of Spring State Machine's built-in persistence — snapshots lost transition history, sub-machine restore was unreliable, and there was no concurrency protection. We built a custom layer that serialized the fu...

Hacker Noon

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