Java Technologies Java Core, JEE, Spring Framework (full proficiency, used from version 1.2), AOP/AspectJ, JMS, ActiveMQ/RabbitMQ, JDBC/JPA/Hibernate, iBatis, JAX-RS/JAX-WS, JSP/Servlets/JSTL, Action/Component based web frameworks (Spring MVC, Struts, JSF, Wicket), Networking (TCP/IP, web-sockets), HtmlUnit, JSoup, Solr/Lucene, JUnit, Mockito, Selenium, POI/iText, Quartz, Swing/AWT, Layout Design, JFreeChart, Ant/Maven ANSI SQL, MySQL/MariaDB, Oracle XE, H2/HSQL, Liquibase, MS SQL Server (2005/2008), PostgreSQL, SQLite, MongoDB, ElasticSearch (basic), OrientDB (basic) Monolithic, Microservices, SOA/ESB, REST, Component-based, Event-driven, Data-centric C#.NET, Python 2/3, JavaScript Linux (Ubuntu/Fedora), Mac OS X, Windows, VM/VirtualBox, Docker, AWS