Kammala jumla mai zuwa: Joubert ya shiga cikin 'yan wasanni na kasa da kasa a matsayin matashi. Babban gasa na farko na kasa da kasa shi ne Gasar Zakarun Duniya ta 2000, inda ya kasance na 15. A kakar wasa ta gaba, ya sanya na 4 a duka ayyukansa na Grand Prix na matasa, kuma daga baya ya gama na 14 a manyan 'yan kasa, kuma ya kasa cancanta ga tawagar Faransa don
Gasar Duniya ta 2001. Shugaban Tarayyar Wasanni ta Faransa, Didier Gailhaguet, ya shiga Joubert a gasar tsalle-tsalle ta 2001, inda ya zama na biyu. Joubert ya zama babban jami'in bayan kakar 2000-2001.