Bluetooth, Continuous Integration, Json, Push Notifications, Ndk, Sdk, Linux Kernel, Performance Tuning, Material Design, Sql Database Design, Git, Opengl, Xml, Restful Apis, Ui Development, Location and Map library, code versioning tools, natural user interfaces, Android mobile apps, Google Play, Google Firebase, Camera, cloud message APIs, API servers, Android Architecture, GSM, offline storage, Cdma, AIDL, Video, Threading, Audio, WiFi