Core Java, J2EE, Spring, Spring MVC, SpringBoot, Spring Data, Spring Security, Spring Batch, Hibernate, Groovy, Grails, Play, Jersey, Angular(2/4/5/6/7), React Js, Redux Frameworks(Saga, Thunk), RxJs, Node, NPM Packages, ExpressJs, Javascript, HTML5, CSS3, CSS/SCSS, Typescript, AngularJs, Bootstrap, Jquery, SQL, MySQL, PostgreSQL, NoSQL (MongoDB, ArangoDB), Gradle, GWT, CAS, JMS, Single Sign-On, Jetty, JBoss, Netbeans, Jenkins, LDAP, JBPM, Intelli J, IDE, Eclipse, Linux, AWS, Web Services, Apache Camel/Thrift/Kafka/Solr, Dropwizard, Tomcat, Cassandra, ElasticSearch, LP/GNLP, Maven, Solar, REST/SOAP/JSON Web Services, Servlet & JSP, JSF, Tuckey, Docker, Google Guice, Jackson, Jetty, AWS EC2, AWS S3, AWS Lambda, RDS, SQS, SNS, etc.