Unsupervised questions filter out candidates who've only done Kaggle. The elbow method is the warm-up, the real scoring is on validation without labels and the marketing-team handoff.
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A customer wants to segment 2 million users. Walk me through clustering, k-means, choosing k, and where it goes wrong.
Unsupervised questions filter out candidates who've only done Kaggle. The elbow method is the warm-up, the real scoring is on validation without labels and the marketing-team handoff.
Updated Aug 2026 · Grounded in real Forward Deployed Engineer interview loops and written to a senior-engineer editorial bar.
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