Legacy ETL modernization is often described as a conversion exercise:
Informatica mapping in. Snowflake SQL out.
That framing is incomplete.
A real migration is not only about translating expressions. It is about preserving transformation intent, identifying what is missing, documenting assumptions, validating target behavior, and ensuring that someone is accountable for decisions before generated artifacts are released.
I have been building a prototype called Data Engineering Copilot around that idea.
