1. Web Technologies ( HTML5, CSS3 , SASS)
2. Any JavaScript framework (angular Js, angular 7+, react js, D3 Js... )
3. Native Mobile apps (Flutter , react Native)
4. Hybrid mobile apps (Ionic 1.x, Ionic 3.x)
5. Api services (NodeJs, sequelize Js, Python, Php)
6. Databases MySQL, Postgres and mongo Db