This week, the Environmental Defense Fund is hiring a social media specialist, while Legacy Interactive is seeking a social games designer. King.com is looking for a mobile game artist, and Symphony Publishing needs a digital media sales associate. Get all the details below, and find more just-posted gigs on mediabistro.com.

For more job listings, go to the Mediabistro job board, and to post a job, visit our employer page. For real-time openings and employment news, follow @MBJobPost.