Hire Java developers who understand the Spring ecosystem, not just Java syntax. Enterprise Java requires: Spring Boot for service development, Spring Security for authentication/authorization, Spring Cloud for distributed patterns (circuit breaker, service discovery, config server), and the JVM knowledge (heap sizing, GC selection, thread pools) that prevents production performance issues.
Production Java demands: microservice architecture (bounded contexts, API contracts, event-driven communication), Hibernate optimization (N+1 prevention, batch fetching, caching), testing (JUnit 5, Mockito, integration tests), containerization (Docker, Kubernetes), and CI/CD.