merge two apps together

hello looking for a fast mobile app dev to work on codes from code canyon. looking to combine different apps to make one. the aim is to make a social commerce web and mobile app

need to be knowledgeable about
social app tiktok insta
social commerce
ecommerce

laravel
react native
flutter
hybrid app
ionic

links to apps i want to combine

https://codecanyon.net/item/6ammart-multivendor-food-grocery-ecommerce-parcel-pharmacy-delivery-app-with-admin-website/36772112

https://codecanyon.net/item/sayhi-a-complete-social-media-platform-for-your-next-tiktokinstagramfacebooksnapchat/48428152