OCR Text Extraction from Invoices

I need an experienced developer to create an OCR solution to extract text from scanned invoices. The solution should handle various invoice formats and deliver data in CSV or JSON format.

Requirements:
Proficiency in OCR technologies (Tesseract, Google Vision, etc.).
Experience with image processing and text extraction.
Accuracy in data extraction.
Deliver data in a structured format (CSV, JSON).
Source code and usage documentation.
Proposal Requirements:
Relevant experience and examples of similar projects.
Estimated timeline.
Proposed budget.