I would not even attend an interview if it's not clear that I can work on Linux in that company. I was forced to use Windows daily for 8 years. After that I got a chance to move to Linux development. I'll never want to go back. Not that Linux is free of problems. But the feeling of being in control cannot be replaced. If I don't accept the wart I can patch it. If I don't want to invest the effort to patch it I live with it. The choice is always mine.