Java

This is a comprehensive Java development skill that covers modern enterprise patterns with Spring Boot 3.x and Quarkus as an alternative stack. It pushes constructor injection, proper layering with DTOs, and Spring Data JPA for persistence. The guidance spans testing with JUnit and Mockito, performance optimization through caching and connection pooling, and global exception handling patterns. You'll want this if you're building REST APIs or microservices and need consistent patterns around validation, security, and error responses. The Quarkus section adds native compilation support and reactive patterns, which is useful if you're considering alternatives to Spring's ecosystem.