I have been creating high quality and excellent iOS and Android apps for 6+ years using Swift, Objectiv-C, Java. Here are some links to web & mobile apps which are developed by me.
I'm expert in Geo-location, GPS tracking, Payment gateway integration, and Social media integration such as Facebook, Twitter and so on. I have good experiences in Firebase, Twillio Api, QuickBlox, AWS and so on.
I can also develop backend apis using PHP(Laravel, Codeigniter), NodeJS, Python, as well as web portal including admin panel.