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What cross-validation strategy do you use, and how do you avoid leakage in CV?

Cross-validation gives a reliable performance estimate, but the wrong scheme leaks data and lies. The signal is matching the CV scheme to the data (stratified, grouped, time-series) and fitting preprocessing inside the fold.

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

Cross-validation gives a reliable performance estimate, but the wrong scheme leaks data and lies. The signal is matching the CV scheme to the data (stratified, grouped, time-series) and fitting preprocessing inside the fold.

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