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It is possible, even though I remember there is an order for the languages so if you need to access groovy from kotlin you may need to change something (let me search what I mean)

<https://docs.gradle.org/current/userguide/building_java_projects.html#sub:compile_deps_jvm_lang|https://docs.gradle.org/current/userguide/building_java_projects.html#sub:compile_deps_jvm_lang>

Yep above link is good, but I think the default is kotlin depends on groovy, so you can call groovy from kotlin but not the other way around, unless you make the changes like the link describes. You can all split your code into a multi project build