hi
please initiate chat to discuss more on this
i will assured you quality service and timely delivery of this.
As You Can See From My Profile, I Am An Expert For Mobile App System Development.
In particular, apps and backend system are my major work.
I have rich experience in JSON/XML, PHP & MySQL Web Service API, GPS and Geolocation API, Facebook API, Twitter API, GPS, Payment Gateway APIs, eCommerce platforms.
please share your requirement in detail so we can proceed further.