Hi Akim,
I need more info about the project. Only with UI and some basic explanation will not help. Please share the existing app url, New UI changes (there is no further changes after confirmed), five me the API functionality documentation. So by reviewing all the info then only the price will be able to decide. After the work I mean once you are ok for the 1st milestone then pay me , then I will share the source code, then we will go for the 2nd milestone, as like once I complete and submit, then you approve the payment, then I will share the 2nd milestone's updated source code.
I am an iOS developer(Swift), and a Project Manager for my team of developers in Android(Native), Ionic, Xamarin, React Native, Web & API Development. I am point of contact for the project till completion. So I will support you instant once shared all the details.
Regards
Sriram