I have over 20 years experience in programming with more than 15 years in web development.
I can set up you project fast & reliable.
Please provide me with more details on how your app should work - which functions to have. So I can do more planning and adjust the milestones.
The MockUp is just to set up the user interface for the app, every button, ... will be there but with dummy data and clicking buttons will not do anything (in most cases).
Then we will make this app alive by adding functionality and a PHP/mySQL-backend for storing the data.
I will use PhoneGap/Cordova, Ionic, Angular, ... to make sure it will be an app for IOS and Adroid.
If you have any questions - just ask.
Best regards,
Fabian