Developing cloud native microservices introduced us to many new challenges. One of the most difficult is to build reliable microservices integrations and their data exchange patterns. In this session I will share my 10 years of experience with building microservices and application runtime platforms with some of the largest European organisations. I will introduce basic principles of developing Java Spring Boot with Apache Kafka. These patterns can be used for: microservices communication decoupling, implementing microservices state stores, avoiding dependencies on traditional database systems. This session is targeted for developers who are interested in learning new cloud native development practices and understanding how event streaming microservices improve their current work. Demo application code will be available to participants.