Backend development with Node(Express), Python(Django, Flask), PHP(Laravel, Codeigniter, Yii, CakePHP), Java(Spring Boot), RoR.
Oauth Authentication, Rest API, Graphql, Third-Party integration, Payment Integration, WebRTC chatting system.
Database Connection/Management (Mysql, Postgresql, MariaDB, MS SQL, MongoDB)
AWS, GCP, Azure, Heroku, Godaddy, Digital Ocean hosting.