I suggest you examine what you’re looking for from your startup. Is it to learn new languages & programming paradigms and to have fun, or to validate a business idea?
If it’s the former, great. Keep going with Elixir, ask questions when you get stuck and have fun. If the latter, I suspect using a language you’re not proficient with is a mistake. You’re validating an idea, odds are you’re going to throw away or rewrite the code you’re currently writing. Use the language that you’re most productive in, so you can get to that stage sooner.
