Fleet, like the other JetBrains IDEs is indeed running on the JVM. It also has some components in Rust and a special GUI framework. There is a great series of

Fleet, like the other JetBrains IDEs is indeed running on the JVM. It also has some components in Rust and a special GUI framework. There is a great series of blog posts about its architecture and design here with a lot of details: https://blog.jetbrains.com/fleet/2022/01/fleet-below-deck-part-i-architecture-overview/ https://blog.jetbrains.com/fleet/2022/01/fleet-below-deck-pa...