- Develop applications using Java/Scala technologies. - Frameworks: Spring, Play2, JavaEE. - Databases: MySQL, Postgres, Oracle. - NoSQL databases: Redis, Memcache, MongoDB. - Application Servers: Apache Tomcat, JBoss, WildFly, Weblogic. - Web Servers: Apache, Nginx. - OS: Linux (Centos, Fedora). - Web Services: RESTful, SOAP. - Others: Jenkins, Docker, New Relic,...