[1] Born in Balneário Camboriú, Brazil, in 1997 Moojen played for Coritiba Foot Ball Club’s youth team.
[2] Moojen attended Lincoln Memorial University where he was a two-time Gulf South Conference Player of the Year and a 2005 NCAA Division II third team All American.
[9] The MISL collapsed at the end of the season and Moojen and his team mates moved to the newly created Xtreme Soccer League.
Moojen, slowed by a toe injury played only seven games, scoring four goals, for the Ironmen before being traded to the Chicago Storm for Randi Patterson on January 31, 2009.
In the winter of 2012–13 he played his second season for the Wichita Wings in the Major Indoor Soccer League where he was the team's captain and leading scorer with 27 goals in 24 games.
In late 2013, Frederico Moojen signed a contract with the Baltimore Blast in the MISL and played with them for one season before the league dissolved.
In 2015, he signed with Montreal club Mont-Royal Outremont and was the Première Ligue de soccer du Québec top scorer for the fifth consecutive year.
[12] In 2016, Moojen began playing for the Florida Tropics SC during the winter in the new Indoor Professional League in the United States as a player-assistant coach.