Hello sir,
I'm an expert Android/Web developer with +8yrs of experience. I have developed many great apps and you can check my profile. Fortunately, I have created many apps similar to your app before and it is working great :)
These apps were contacting APIs and setup login sessions and sign up and do a lot of stuff.
I can assure you that I will deliver an app beyond your expectations in both technical and quality sides.
Please contact me for more suggestions and to get more details about your app. and let's get this job done.
Thanks and best regards
Ibrahim Radwan
Zend Certified & Android Developer