Alex is a Brazilian chess grandmaster, having attained the title in 2007. He won five gold medals at the Pan American Youth Chess Festival: in the U10 division in 1996 and 1997, U12 in 2000, U14 in 2002 and U18 in 2005. He also won the South American Junior Championship in 2006, 2008 and 2009. Fier won the Brazilian Chess Championship in 2005, and won the 65 Anos da Federação tournament in São Paulo in 2006.
Alex won the Open of Sants, Hostafrancs & La Bordeta in Barcelona in 2009 and 2014. He briefly appeared in the 2011 World Cup, but faced elimination after losing to GM Alexander Morozevich in the second round. Two months later, he won the 2nd Latin American Cup in Montevideo, edging out GM Diego Flores in a tiebreaker. He competed in the 2013 Chess World Cup, but was eliminated after his loss to GM Baskaran Adhiban.