1. Set up the project using Maven or Gradle with Kotlin plugins.
2. Define data classes for DTOs and JPA entities.
3. Configure Spring Boot components using `application.yml` and `@ConfigurationProperties`.
4. Implement REST controllers using `@RestController` and data classes.
5. Implement service layer with `@Service` and `@Transactional`.
6. Implement data layer with Spring Data JPA repositories.
7. Write unit and integration tests using JUnit 5, Kotest, and Testcontainers.