Leifert started working at Rede Globo presenting the Pro Rad in 2006 and videogame related stories for Esporte Espetacular.

He covered the Brazilian football season in 2008, the 2007 Pan American Games in Rio de Janeiro and the 2008 Summer Olympics in Beijing.

Between January and March 2016, on Sundays, he presented the first season of The Voice Kids, a version of the reality show for children and young people from nine to fifteen years old.

On August 27, his departure from É de Casa was announced to become the presenter of Big Brother Brasil from the 17th season, replacing Pedro Bial.

In 2016, he started to present the program Zero1, focusing on video games, culture, Geek, and the pop universe, under the direction of Alexandre Lannes and Eduardo Xocante, also from the Boninho nucleus.