Fix Website Bugs & Improve Existing PDF-to-DWG Engine (AI/Python)

I have an existing SaaS application, archidwg.com, that converts architectural drawings into editable DWG files. The application and engine are already developed. DXF-to-DWG and vector PDF-to-DWG work, while scanned PDF conversion needs improvement. I need a developer to: 1. Identify and fix remaining website bugs. 2. Improve the existing scanned PDF conversion engine. 3. Test the full workflow, including uploads, processing, and downloads. 4. Preserve all existing working functionality. Experience with AI coding tools such as Claude Code, Cursor, or Codex is very important. Python, OpenCV, and AutoCAD/DWG knowledge are highly preferred. Budget: $60 fixed price for the complete agreed scope. This is an improvement and debugging project, not a rebuild.