Hello,
I have gone through your requirement, We have done Similar Jobs, I will share the link.
As Per Your requirement, You have App Design and API's Ready,
I have great experience in Ionic, Ionic2, Ionic3, MEANjs, Meteor, PHP, CodeIGniter
Please connect with me for further discussion, I will share my past work with you.
Looking for your response.
Thanks
Akil Khatri