There are two interviews for this position: The first one was about questions regarding what you need to know for this position: Java, OOP, Spring Boot, Databases, ORM, etc. I recommend studying concepts for this one. The second one was an implementation exercise, where they give you a scenario and then you have to make a UML diagram for it. Later they'll give you 24 hours to make a program that accomplishes the implementation scenario, so in a few days after, they'll call you to review your solution. After this one, they tell you if you're in or not.