Let’s consider skills that are required for junior, middle, and senior Java full-stack developers. Junior developer’s must-have skills are: Java Core, Spring (Core, MVC, Security, Data), Jdbc/Hibernate, SQL (MySQL/PostgreSQL). In turn, mid-level Java developer’s skills are the following ones: Java Core, Spring (Core, Boot, MVC, Security, Data, Cloud, Integration), Jdbc/Hibernate/JPA, SQL (MySQL/PostgreSQL), Message Brokers, Docker.
Finally, senior full-stack Java developer’s must-have skills include knowledge of Java Core, Patterns, Spring (Core, Boot, MVC, Security, Data, Cloud, Integration), Jdbc/Hibernate/JPA, SQL (MySQL/PostgreSQL/Oracle), NoSQL, Message Brokers, Docker, AWS, Multithreading, Microservices, CI/CD, JavaScript ES5/ES6, React+Redux/Angular.