Nubank Migrates 100K Datasets with Devin AI

What was done

Nubank faced an 18-month migration of their 8-year-old, multi-million-line ETL monolith involving 1,000+ engineers and ~100,000 data class implementations. By deploying Devin AI agents fine-tuned on examples of previous manual migrations, engineers delegated tedious refactoring — tracing imports, performing delicate steps, handling edge cases. Data, Collections, and Risk business units completed migrations in weeks instead of months, achieving 12x efficiency improvement and 20x cost savings.

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