Need an Experienced App Developer for a Fully Functional document Scanner App (Like CamScanner)

Hi, I am looking for a skilled mobile app developer (Flutter/React Native preferred) to build a premium Document Scanner App for Android and iOS.
The app should have all the standard and advanced features available in top scanner apps on the Play Store.
Key Features Required:
Smart Auto-Edge Detection & Perspective Correction.
Image Processing Filters (Magic Color, B&W, Grayscale).
Image to PDF / PDF to Image creation.
OCR (Optical Character Recognition) to extract text from images.
E-Signature, Watermark, and Highlight tools.
File Compression & Resizing.
Folder Management, App Lock, and PDF Password Protection.
Cloud Sync (Google Drive/Dropbox) & Easy Sharing.
Requirements:
Must have experience with OpenCV (or similar image processing tools) and ML Kit (for OCR).
Please share links to similar camera/scanner or utility apps you have built before.
I will need the complete Source Code and IP rights upon completion.
Please mention your estimated budget and timeline in your proposal. Start your proposal with the word "SCANNER" so I know you have read the details.