Hi
I have read your requirement very carefully
So I am really confidence for that with flutter, react native mobile and web app
I have done a lot of mobile apps and front and Firebase or Any Admin Panel as backend successfully
I have finished some google map tracking app, product management app, chatting app with ReactNative CLIT & Expo, Flutter, IONIC, firebase, Laravel, Django, ExpressJS, SpringBoot, etc
I will build in your mobile app perfectly in time
Hope your kind contact
Best regards