AI-Powered PDF Updater

I need an AI-driven solution that can open a finished PDF—typically an employment contract, a payslip, or another HR-related document—locate the existing personal information inside it, and swap that content for new data without disturbing the original layout, fonts, tables, or signatures... (Budget: €250 - €750 EUR, Jobs: Automation, Computer Vision, Docker, JSON, Python, Scripting, Software Development)