Hi there
I'm experienced in android, iOS, and swift and VIPER architecture. I have enough skills in flutter and react native for mobile. And we have an experienced team for android. With flutter or react native, you can have one code for both platforms iOS and android. I need more info to help me to give you the exact price and time.
Please contact me over chat to talk about your project in detail and let me see your UI designs
Also, we support the app for 6 months so don't worry about future bugs.
Hope to hear from you soon.
Thanks