Revamp React Native App

Redesign and rebuild the existing fully-working React Native App in both iOS and Android stores which is used to create posts and share images, videos; now it is time for a complete redesign and feature expansion while keeping as much of the existing codebase as possible. I am looking for someone who is good with knowledge of posts sharing, friend requests management, My Profile page, Events creation and guest management, payment integrations, gifting system and integrations with Online platforms, Vendor management. More features will be explained during the discussions.

New functionality
• Push notifications (Firebase Cloud Messaging is fine, but I am open to alternatives)
. Event Management
• Secure user authentication (e-mail, Face ID, biometric, PIN)
• In-app purchases like invitation cards, service charges, including sandbox testing and receipt validation.