Question Life and IT job in Japan

Hi, everybody!
Is there anyone who works in Japan as developer, QA specialist or anybody else who works in IT? Is it possible to live in Japan and work for japanese company without education? More precisely, is it legal for a foreigner? Several years ago I have taken programming and testing courses and at present time I have certificates on its. Are they usefull at employment? I already have testing work expirience. Can I get a job as developer or QA engineer after finishing some language school? And which kind of visa I'll receive in this case?

Unless you have about 10 years of relevant experience, you will need a college degree to be able to get a work visa in Japan.