r/fintech
The shift from legacy core banking to cloud-native infrastructure
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I’ve been reading a lot about how mid-tier banks are finally moving away from legacy core banking systems (like FIS/Fiserv) toward cloud-native alternatives like Mambu or Thought Machine. On paper, the flexibility and API-first approach make complete sense, but the actual migration process looks like an absolute nightmare for compliance and data integrity. For those working in banking tech or integrations, are you seeing this shift actually happen in real-time, or is the risk of downtime keeping traditional banks locked into legacy systems for good?