Need phone apps for my site

I am looking for a mobile app developer who can create an Android and IOS apps for my website. I have a rough idea of what I want, but I need help finalizing the design. The ideal candidate will have experience in designing mobile apps and be able to create a user-friendly interface for my app. The app should be compatible with Android and IOS operating systems. I want the app to have user registration/login functionality, allowing users to create an account and log in to the app. Additionally, I would like to include social media integration to make it easy for users to share content from the app on their social media accounts. I will need to app to work with my site and be able to transfer information from my data base to the app and from the app to my database.