Java: JavaSE – Collections, concurrency, net, swing/javafx, generics, XML jaxp/jaxb, i18n; JavaEE – Servlets, JDO/JPA/JDBC, JAX-RS/JAX-WS; JUnit, JavaScript/Ajax, Vaadin framework, Spring framework, Google AppEngine, Glassfish, Subversion/Git, Maven, SQL, HTML, Android