He closely cooperates with record producer RedOne and often also with Bilal Hajji.
Janussi wrote hits for the A-Teens in 2002, and co-produced the American singer Vanessa Hudgens's album V in 2006, the German pop group No Angels and the British X Factor winner Shayne Ward's album Breathless in 2007 and co-wrote the song "Tell Him" for Ward.
He also technically assisted on 4 tracks in Westlife 2007 album Back Home.
Notable artists include Jennifer Lopez and Pitbull in "On the Floor", "Dance Again" and "Live It Up",[1][2] as well as for Mohombi, Cher Lloyd, Nicole Scherzinger, Shayne Ward, JLS, Taio Cruz, Khaled, One Direction, Paulina Rubio, Havana Brown and Skitszo.
AJ Junior also co-wrote the 2013 qualifying song for Russia by Alexey Vorobyov entitled "Get You".