Human in the Loop: Using Confidence Scores to Build Reliable Document Extraction

Why Fully Automated Extraction Fails Every document extraction project starts with the same pitch: upload a PDF, get structured JSON, never look at the document again. It works in the demo. It falls apart in production. The problem isn't that AI extraction is inaccurate — it's that it's inconsistently accurate. A well-structured invoice from a regular supplier extracts perfectly. A scanned contract with coffee stains and handwritten annotations does not. And when the extraction is wrong, you don