Working holiday opportunities to use programming background with no japanese?

Hi i'm considering doing a japan working holiday visa but uncertain with no fluency what job I might be able to get. I currently work as a Business Analyst for the last 3 years doing websites, database and api work and have heard there is a shortage of programmers. Was wondering if there are any jobs I could do in I.T. while I improve my fluency or if I'm limited to english teaching with zero japanese? Also any advice from people currently doing I.T. in japan?