Mainly Android (Java/Kotlin)/Java Developer. Huge experience with BLE, Blueooth and Beacon devices. Languages used: Java, Kotlin, PHP, JavaScript, TypeScript, CSS, HTML, C, C++, C#. Frequently used technologies: HTTP/HTTPS, MQTT, FTP/SFTP. IDEs: IntelliJ, Android Studio, Visual Studio Code, Visual Studio, Arduino IDE. OSs: Ubuntu, Windows.