How to implement fast and cost-effective backend for a multiplayer game using Scala, Akka and GraalVM

Actor systems are perfect match for multiplayer game backends - Akka actors translate very well into in-game entities, and AWS Lambda is a convenient way to deploy them without much of DevOps hassle. In this talk I will present how to implement fast and cost-effective backend for a multiplayer game using Scala, Akka and GraalVM.
Let's go through some libraries from ZIO ecosystem that will allow us to implement API layer with ZIO HTTP
How Libretto, a Scala DSL for concurrent programming, can be used for writing custom stream operators
How to make Scala more approachable and productive?