HTML, CSS, JavaScript, jQuery, React / Redux.
Java EE, Spring, Spring cloud, Spring flux, Spring Integration, Spring Security, Apache Mina, Apache CXF, Thymeleaf, Jersey, Apache Tomcat, EclipseLink, EHCache, GWT, Jetty, JSoup, Selenium.
Java SE, Swing, Java FX, Apache Log4j, Google Gson, Google Guava, Google Guice, Hibernate, Jackson, Jersey, JUnit, SLF4J.
Mysql, Mariadb, Redis.
Mac OS, Linux, Windows, Raspberry, Android, iOS.