In the 5th part of the Hibernate Reactive with Eclipse Vertx tutorial we observe the topic of object level permissions. It is our duty as software engineers to implement strong protection of applications. We need to verify that secured APIs are accessed by authenticated users and also that they could modify only those records that are owned by such users. In order to this we make use of the concept of object level permissions. Object level permissions are used to verify if a user should be allowed to act on a particular object, which will typically be a model instance. This type of protection could be accessed in many popular web frameworks, such as Django , Laravel , Spring Security etc. Vertx does not provide such tool, and in this tutorial we research how to build such functionality.