Develop beta version of a online consultation with doctors

I need to develop a first version of a mobile app where users can list online available doctors to consult.

A user login, he finds a list of available doctors, he choose a doctor, confirm and will have a screen where doctor information are shown (description, phone, skype...)

A doctor login as normal user at first, then in profile section he enters a private key (received outside the app) and he will be marked as doctor, then he can add contact information and then make himself available to receive calls.

The app will only show contacts, the call are made outside the app.

A user can consult one in 10 minutes, so in homepage, the api tells the app that he is in consultation we show the doctor info not the list of available doctors.

Login will be with firebase (google and facebook enabled), the app will have a firebase token that it will send to the API wchich will return a token. The token will be used to the rest of API calls.

In attachment you can find a documentation about how the screens will look like and how to navigate between them.

PS: The api is in progress and I am working on it in parallel so we can work together if needed to make sure the coordination is good.

I remain available for any additional information.