Job Site: Move and Stay

While it's mainly dedicated to providing people with serviced apartments, Move and Stay also has lists of international schools around the world. What you'll have to do is choose a city, then go to relocation tools, then to international schools and universities.
Keep in mind that these are not current openings, but just a list of international schools and universities in that city. You'll have to contact them for more info. Or better yet, try to attend an international school job fair if possible.
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