Work for Raven!
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Eric Biessman, "Prime Minister" of Raven, has updated his .plan with a reminder that the company behind games like Soldier of Fortune and Heretic II is still looking for level designers experienced with designing maps for Quake-engine games.
Unfortunately (no doubt due to the horrible American immigration system) they are only accepting applicants from the USA at the moment, but if you're on that side of the Atlantic and think you have what it takes, check his .plan for the full details.