Advanced: Java Core, Maven, Gradle, GIT, Docker, REST API.
Intermediate: Spring (Boot, Rest, MVC, Security, JWT), Hibernate, JPA, ORM, JDBC, R2DBC, Junit, Mockito, SQL, Spring Cloud(Eureka, GateWay, Stream, Resilience4j), PostgreSQL, Liquibase. Swagger.
Pre-intermediate: Spring WebFlux, MongoDB, Redis(Jedis), Kafka, GraphQL, RebbitMQ. MinIO, GRPC, Debezium.