— Java: Java 8+, Java Core, Collections, OOP, SOLID

— DB: Hibernate, JDBC, RDBMS (MySQL, PostgreSQL, SQLite, H2)

— Spring: Spring Core, Spring Web, Spring Security, Spring Boot

— Web Development: React, JavaScript, Servlet, JSP, Tomcat, HTML, CSS, XML, JSON

— Tools: JUnit, Maven, Gradle, Mockito

— Version Control Tools: Git

— IDE: IntelliJ IDEA

— Operating systems: Windows, Linux (Fedora)

— Knowledge of algorithms and data structures