Further requirements include "a minimum of one shipped MMO as a network programmer."
Lionhead shipped Fable III in October of 2010, and the company is rumored to be developing a "controller-based" Fable IV in 2013, according to Eurogamer.
When contacted by Eurogamer, Lionhead had this to say in an official statement: "Thanks for checking in with us! We're happy to tell you all about what we're working on. Just apply, get hired, and we promise to spill our guts!"