[GoNative]

You would have to have some pretty amazing skills for it to be worth a Japanese company to try and sponsor your working visa. They would have to justify to immigration why they need to hire a foreigner. They'd have to show that there's no Japanese person as qualified or suitable for the position. They'd also have to justify to themselves why they'd hire someone who doesn't speak or read their language fluently. So overall it would be really difficult to get a position here but not impossible. Do lots of research to see what sort of positions may be available to foreigners in the programming industry here and learn Japanese!