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

Forecasting a single series is textbook work; forecasting a million SKU-stores that have to reconcile, where stockouts cost more than overstock, is what the interview actually tests. The strong answer is global, hierarchical, and cost-aware.

Updated Sep 2026 · Grounded in real GenAI, LLM, and AI/ML engineering interview loops and written to a senior-engineer editorial bar.

Forecasting a single series is textbook work; forecasting a million SKU-stores that have to reconcile, where stockouts cost more than overstock, is what the interview actually tests. The strong answer is global, hierarchical, and cost-aware.

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