Willing to become a Java Backend developer, what course to choose ?

I’ve got 2 years professional experience on Android, using mostly Kotlin and all the fun tools that everybody uses (Dagger, Coroutines, Jetpack, etc…) and I want to switch to a backend developer role.

As I am confortable developing on top of the JVM, I think that becoming a Java developer could be a cool move, which won’t take me years to achieve.

Do you know any course I could follow on my own (I can’t quit my job to study full time) ?

原文链接：Willing to become a Java Backend developer, what course to choose ?