Things I do are
1. Web application development
2. Android applications
3. User Authentication systems
4. Qrcode code verification
5. Ussd Applications
6. Website development
And all this application I design them using the following programming language
1. Php
2. Cordova
3. Ionic
4. Angularjs 4
5. Javascript
6. My SQL or phpmyadmin
7. Native app development using Android Studio
Server I work with includes.
1. AWS SERVER
2. Digital Ocean
3. Shared Hosting
4. Linux servers