Java (Core, Streams, Multithreading), Java EE, OOP, SOLID, Spring (Boot, MVC, Security, Data, Cloud), JPA/Hibernate, MySQL, PostgreSQL, MongoDB, Redis, RabitMQ, JSP/Thymeleaf, React JS/Next JS, Docker, REST/SOAP, SOAP UI, GraphQL, GIT/SVN, Unit testing (Mockito, JUnit), Algorithms, Networking, Data structures, NodeJS, Intellij IDEA, VS Code.