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Design a demand forecasting system (retail/inventory/capacity).

Forecasting one series is a textbook exercise; forecasting a million SKU-stores that must reconcile, with stockouts costing more than overstock, is the real interview. The strong answer goes global, hierarchical, and cost-aware.

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

Forecasting one series is a textbook exercise; forecasting a million SKU-stores that must reconcile, with stockouts costing more than overstock, is the real interview. The strong answer goes global, hierarchical, and cost-aware.

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