All things change constantly! So dealing with constantly changing data at low latency is pretty hard. It doesn't need to be that way. Apache Kafka, the de facto standard open-source distributed stream processing system. Many of us know Kafka's architectural and pub/sub API particulars. Viktor will show how to build sophisticated stream processing apps (not clusters)! Viktor will take for a spin Kafka Streams, spring-kafka and spring-cloud-streams frameworks to stream processing applications.