Earlier quoted context omitted.
I'm here on a study visa, arrived last year, so I do have a temporary residency status.
But the problem is that you can't change your study visa to a working visa (BTW, this is not legal advice! Make sure to check what I'm saying with a lawyer). So you will lose residency when you change visas. Potentially the easier way to go (assuming you are doing some high tech thing and you are getting an equivalent to an "engineering" degree -- CS should be fine) is to get a job and have the company sponsor your v…
Sure you can, I have done it and I know tons of people who have too. Usually no lawyer required; assuming you have a degree (or is going to graduate soon) and you have a job offer, just apply at Immigration.
http://www.immi-moj.go.jp/english/tetuduki/kanri/shyorui/02....
Note that technically you don't "change visas" -- visa is something that's required in order to enter the country -- you change "status of residence". Usually people use the terms interchangeably, though.