I always (probably ignorantly) assumed immigrating to Japan to be difficult based on news articles about tight immigration laws. What is the job market like without speaking Japanese?
I don't know much about job market, but I met many expats working as software engineers and they didn't speak any Japanese.
Still I would not recommend coming to Japan unless it was a life goal. This is not an easy country to live in or build wealth in. Both the language and career will be playing life on hard mode. I love it here, but it was a life goal I was willing to trade for.