For a 13,000+ SKU Shopify catalog, manual sorting was unsustainable. I built a keyword-trigger classification dictionary that routed items automatically: brand standardization (1,200+ items), TCG mapping, cross-sport collision overrides, and product family assignment. The engine reduced manual review time and eliminated recurring misclassification errors. I tested in small batches, fixed pattern failures, and documented the rules so the client could maintain the system independently.