As per their hiring page....
http://www.unitedfrontgames.com/careers/job-openings/network-multiplayer-programmer/
http://www.unitedfrontgames.com/careers/job-openings/network-multiplayer-programmer/
We are looking for an experienced network programmer to work with our online team to develop the multiplayer features of our next gen console title. The candidate must have solid C++ programming experience, understanding of network programming models, excellent communication ability, and a passion for creating world class online titles. The ideal candidate will also have been credited on several console titles, worked with multiplayer middleware packages, and have experience with state replication, interpolation, bandwidth optimization, and knowledge of common multiplayer features such as matchmaking, invites, game lobbies, leader boards, stats, etc.