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Honest lessons from real projects

No theoretical fluff. These are notes from the field — what worked, what broke, and what I'd do differently.

Opinion May 2026 · 8 min read
Why Fraud Detection Models Block the Wrong 1% of Transactions

The false positive next to the missed fraud. The one the model caught is the one that mattered least. I trained a LightGBM model on the public Kaggle credit card…

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