Comment by sharedptr

Well I think I have some experience to talk about Japan. Not so much about Korea.

My experience is that English in Japan isn’t really spoken outside of big tech firms and even there the quality isn’t great.

I have tried organizing an event on the same topic in Japanese and in English, almost no one showed up in English but it was full in Japanese.

They have their own alternatives to some services and stack overflow, qiita.

The thing is that they don’t really need to speak English and for the cases they need English they bite a foreigner.