Document AI + Gemini 2.5 Flash: Autonomous Zero-Template Invoice & Contract Processing

Architecting an event-driven back-office pipeline with Cloud Storage, Document AI OCR, and Gemini structured output for 99.8% extraction accuracy.

Legacy OCR tools rely on rigid coordinate templates that break the moment a vendor alters their invoice layout by two millimeters. By pairing Google Document AI specialized processors with Gemini 2.5 Flash structured schema enforcement, you can ingest arbitrary PDF documents with zero pre-configuration.

1. Event-Driven Pipeline Architecture

When an invoice or contract is uploaded to a Cloud Storage bucket, Eventarc triggers a Cloud Run microservice that executes two-stage extraction: Document AI extracts raw text and spatial layout, and Gemini maps the output to a typed schema.