How I Proved a 12-Million-Record Data Migration Was Actually Correct

This story was originally published on HackerNoon at: https://hackernoon.com/how-i-proved-a-12-million-record-data-migration-was-actually-correct.
I have spent two decades building and leading engineering teams. Here's what I learned, so you can apply it to your own migration.
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The article discusses the importance of verifying data during a migration, as a green checkmark can be misleading if the data is incorrect. The author shares their experience of migrating 12.3 million records from a legacy Oracle monolith to microservices backed by PostgreSQL and DocumentDB, and how they achieved a 99.9994% match rate by following a series of steps to ensure data correctness.