Node.js App Update for WhatsApp Sync

I need an experienced Node.js developer to update my existing app for WhatsApp synchronization. The updates need to cover:

- Message Synchronization: Ensure all messages are accurately synced across platforms.
- Contact Management: Update the contact management system for better integration with WhatsApp.
- Media Handling: Improve the media handling capabilities to cope with various types of media.

The app currently uses session-based authentication. Experience with Node.js and understanding of WhatsApp's API will be crucial for this project. If you're skilled in enhancing Node.js apps and can help make the necessary updates for this WhatsApp sync project, I look forward to hearing from you.

Here is some key features to be include,

Admin Dashboard with secured authentication
User Message Portal
Local Database Integration MongoDB
Send messages
Receive messages
Send/ media (images/audio/documents)
Send media (video)
Send stickers
Receive media (images/audio/video/documents)
Send contact cards
Send lists
Message replies
Join groups by invite
Get invite for group
Modify group info (subject, description)
Modify group settings (send messages, edit info)
Add group participants
Remove group participants
Mention users
Block/unblock contacts
Get profile pictures
Set user status message
React to messages
Star/Pin of a Message