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Find the k most similar items in a 10M-vector index without a hosted service.

Brute force is O(N*d) per query and dies at ten million vectors. The answer is approximate nearest neighbor: trade a little recall for orders of magnitude less work, and know exactly which knob buys what.

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

Brute force is O(N*d) per query and dies at ten million vectors. The answer is approximate nearest neighbor: trade a little recall for orders of magnitude less work, and know exactly which knob buys what.

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