Make my app on flutter for both iOS and Android

Hello everyone,

My app is an app map based, with stores markers, don’t included navigation like Uber or something similar, just find stores near me, is a kinda similar to “Weedmaps”, my app have around 10-12 screens including the menu,

I want also an admin panel to add that stores that the map will show,

I want to hear offers, I’ll select the best price and portfolio,

Thanks in advance

(In photos Weedmap app)