What technical areas should be mastered for professional growth?

For professional growth in Java development, it is worth mastering the following technical areas:

• Modern Java: new language features (e.g., lambda expressions, Stream API, modules).
• Frameworks: Spring (Boot, MVC, Security), Hibernate for database interaction.
• Microservices: architecture, interaction via REST, gRPC, configuration management.
• Databases: SQL and NoSQL, query optimization.
• Testing: unit tests (JUnit), integration tests, mocking.
• Build tools and CI/CD: Maven, Gradle, Jenkins, Docker.
• Design patterns: understanding and applying templates.
• Asynchronous programming and multithreading: CompletableFuture, Executors.

Mastering these areas will help create high-quality, scalable, and maintainable applications.