Explore the event-driven architecture (EDA) in a purely functional way. Learn to design and develop distributed systems that scale. Identify common design patterns in such systems.

In the same spirit of Practical FP in Scala, we will develop a distributed system written in Scala 3 that meets the requirements of a modern software architecture capable of processing billions of events per day at scale powered by Apache Pulsar and Fs2 streams.

The system also includes a Web Sockets service powered by Http4s, and two Web applications (one written in Elm; another in Scala js), just for fun!

Although the application picks a particular design and implementation, the concepts should easily translate to other designs in the same space that can be built on top of Apache Kafka, Rabbit MQ, or other message brokers.

Additionally, essential reading material is recommended for those who wish to dive deeper into topics such as Distributed Systems, Streaming Systems, Event-Driven Applications, and Observability.