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Where does it mention anything about a tourist visa?

Japan has a fairly relaxed visa system at least if you are from the western world. If you are under 30 - a working holiday visa may be good to start with:

http://www.au.emb-japan.go.jp/en/visa/visit_japan_workinghol...

Not available to USA folks.

We're aiming this at people who can get/already have a visa. I haven't specifically mentioned it on the front page, as I think most people who would consider applying for this would already understand the visa situation. I have mentioned the requirement on the actual "apply" page, however.

Any japanese company can get a visa for a programmer incredibly easily just by filling out a form and submitting some documentation. Very different situation from elsewhere.