Viết app giao tiếp/quản lý khóa thông minh

Dear Client. I am a senior and full stack iOS, Android mobile app developer. I have been working with mobile apps (native and hybrid) for many years. My iPhone, Android apps are uploaded to AppStore and Playstore (I will provide you link if you want) I can also build flexible mobile website. Cloud service: Amazon web service, Quickblox, Parse, Ejabberd, Openfire, Firebase Hybrid skill: ionic framework, React native, Xamarin, Titanium Main skill: Payment integration, SMS integration, Geo location service, Push notification, In app purchase, Database management, Graphic Design I have great experience in -- Uber system -- VOIP applications -- GPS Tracking app -- Messenger app -- Online shopping app My giant experience will greatly help me to finish your project easily and I hope long term relationship with you. Best Regards.