[1] In 2007 he joined Grêmio's youth categories, staying at the club for three years before working at Juventude, Caxias and Vasco da Gama as a video analyst.
[2] After knowing Paulo César Gusmão at Vasco, Muller became his assistant at Ceará,[3] Atlético Goianiense, Bragantino and Joinville.
In February 2016, he was appointed manager of newly-formed side Flores da Cunha,[4] but resigned in April.
In 2017, Muller worked as an assistant at Luverdense before moving abroad, being in charge of Paraguayan side 3 de Febrero's under-17 squad.
[8] After two matches (one in Copa do Brasil and one in Série B), he returned to his previous role after the appointment of Allan Aal.