With an extensive career in Chile, Mitjaew began his career with
Unión La Calera in the
1974 Primera División de Chile, where he previously worked as fitness coach, becoming the youngest manager in the history of the
Chilean top division. In the Chilean top level, he also led
Coquimbo Unido,
Audax Italiano,
Palestino,
Naval,
Rangers,
Deportes Concepción and
Deportes La Serena.
Deportes Linares, Rangers, Audax Italiano and
Santiago Morning. He recommended three players from the Bolivian football for
Universidad de Chile who finally did not sign with the club: Clemilson da Silva,
Jaime Cardozo and
Álex da Rosa. ==Political career==