Developing native Android applications (with Java) for five years. Also, i am developing native iOS applications (with Swift) for two years. Native Android Development (Java, for 5 years) Native iOS Development (Swift, for 2 years) Extensible Messaging and Presence Protocol (XMPP) SOLID Principles, Design Patterns Material Design WebSocket, WebRTC Dependency Injection REST/SOAP Services Git, SVN, Jira Android Application Testing: Espresso, JUnit Gradle, Proguard Firebase, Fabric, Crashlitycs NodeJS C, C++, C#, ASP.NET Web Forms MSSQL, MySQL, SQLite Accessibility MATLAB Robot Operating System (ROS) Node.js