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How do you change or remove a feature without breaking the models that depend on it?

A data engineer renames a column and three production models silently start scoring on garbage. Features are a shared contract, and changing them needs the same care as a breaking API change. Here is the discipline.

Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.

A data engineer renames a column and three production models silently start scoring on garbage. Features are a shared contract, and changing them needs the same care as a breaking API change. Here is the discipline.

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