Sanchez has worked in the music business as a record executive president and A&R. At 17, he became A&R for the independent New Jersey label Rufftrax, signing producers James Christianand B.O.P. He also ran his own label Cube Recordings which released material from Felix Da Housecat, Steve Mac, Paul Woolford, and DJ Sneak, and was also President of A&R for Steve Angello's Size Records. Junior now operates his own record label "Brobot Records" distributed by Armada Music.
Junior has released original music under these names or aliases: The Controllers [w/ Steve Mac], S-Men [W/ DJ Sneak + Roger Sanchez], Da Mongoloids [A DJ Collective w/ Armand Van Helden, Daft Punk, DJ Sneak, Roger Sanchez, Todd Terry, Ian Pooley, Laidback Luke, Basement Jaxx, and The Rhythm Masters, Da Shapeshifta Project [W/ Harry “Choo Choo” Romero], Dark Heads [W/ Dave Carlucci], Nitebreed [W/ Harry “Choo Choo” Romero], Output/Teletronik [W/ Chris Haliani], Riot Society [W/ Laidback Luke + Chris Haliani], and Subspecies [W/ Armand Van Helden].
Remixing and collaborations include Daft Punk, Madonna, Shakira, Katy Perry, Good Charlotte, Placebo, The Bravery, Gorillaz, Blaqk Audio, Hot Hot Heat, Roisin Murphy, Felix Da Housecat, The Faint, New Order, Emiliana Torrini, Jamiroquai, Giorgio Moroder, Moving Units, Les Rhythmes Digitales.