IOS-to-Android App Conversion

I am in need of a developer who can convert my existing iOS app to Android. I have the source code for the iOS app, which includes user-authentication and payment gateway integration using Firebase and Revenuecat. The app also utilizes a simple database, as the app is a quiz app and it stores the results and some other minor things. While I'm unsure if I want the exact same layout and design for the Android app, I'm open to suggestions or advice on this front. Ideal candidates will have extensive experience in both iOS and Android development, particularly with porting apps between the two. Familiarity with user-authentication protocols and payment gateway integration is necessary. Additionally, any expertise or guidance regarding design and layout will be greatly appreciated.