There was a take home test, the test itself is ambigious, but not in a gud way, it's more of an amateurish ambiguity set by a "core team" and it was ridiculous tbh, their "core team" is a bunch of regular java devs it seems, but the role description talks about jvm internals knowledge etc, maybe that's why redis dominates, it is a joke really, bunch of regular "api" type java devs who've never done anything serious setting up the test and the review was even more ridiciulous, for any serious jvm guyz, stay away from them.