In my time at Stripe, few of the candidates were fluent in Ruby, but it almost always took less than a couple weeks to get spun up with it. If you're looking for Ruby talent, it's more challenging.
Ruby is so powerful but simplicity is the best if other people are going to read and maintain your code. Go is great for this.
Ruby is so powerful but simplicity is the best if
other people are going to read and maintain your code.
More advanced Ruby (writing your own operators/iterators/whatever, metaprogramming, extending the language itself, whatever) is best reserved for Ruby frameworks, not applications.