Java Software Development

Development of reliable enterprise-level server solutions on the Java 17/21 and Spring Platform stack. Building services with Spring Boot, Spring Security (JWT, OAuth2/OIDC), Spring Data JPA/Hibernate. Designing multi-module systems, implementing distributed transaction patterns, and organizing queues via Apache Kafka. Writing unit and integration tests (JUnit 5, Mockito, Testcontainers), optimizing JVM and garbage collector performance (GC tuning).