Liebers began skating in 1994. He won the 2002 German junior national title and competed in four seasons of the ISU Junior Grand Prix series. He finished 13th at the 2006 World Junior Championships but, while practicing following the event, he broke his left leg when he hit a rut in the ice. As a result, he missed the 2006–07 season and had a metal insert in his leg until March 2007, returning to the ice in May.