While playing for D.C. United's academy, Mendes tallied 25 goals and 17 assists in 45 matches with the team, which helped him earn NSCAA Club All-American honors in 2015.
During the Spring 2016 season, he tallied 21 goals and had 12 assists with the Generals, helping them win a state championship over First Colonial High School.
Mendes was recruited to play for the Virginia Cavaliers, considered by many to be one of the most elite collegiate soccer teams in the United States.
Mendes registered two assists in the inaugural game for Major Arena Soccer League 3 club Fredericksburg Fire FC.
[11] Mendes made his debut for the United States national arena soccer team in August 2022 against Mexico.