I would say golang has been a strong contender for that role for a while now besides the usual java/ruby/python stacks. You can use many languages for your back

I would say golang has been a strong contender for that role for a while now besides the usual java/ruby/python stacks. You can use many languages for your backend, but golang is IMHO the best out there right now (but as always: it really depends on your use-case)