Cryptozoic is hiring for a lot of different positions, including Game Design.
From their facebook:
We have new job openings at Cryptozoic! We're looking for awesome people for the positions of: Brand Manager - Trading Cards and Collectibles, Art Acquisition Manager, Associate Game Designer - Digital, Game Designer - Digital, Game Designer - Story and Content, and Producer - Digital. If you're up for the task, head on over to our Careers page for information on each opening. Good luck and we hope to hear from you soon!