Adaptive skill practice — find your level, get sharper.
Spring Boot practice
DI, REST, and data — the backbone of Java backends
Master Spring Boot (v4 / Spring Framework 7) — the IoC container and dependency injection, beans, stereotypes and scopes, auto-configuration and starters, building REST controllers, Spring Data JPA repositories and transactions, configuration and profiles, validation and global exception handling, Actuator, and testing. Core concepts are evergreen; version-specific changes (Jakarta EE 11, JSpecify null-safety, Jackson 3, REST API versioning) are tagged (Spring Boot 4). Part of the Developer track.
• Meets you at your level — never too easy, never too hard.
• Adapts every question to how you’re doing.
• Tracks your level over time. Skill practice, not a test.
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