Amarikwa attended Liberty High School. He was a member of the Bakersfield Alliance club soccer team and played college soccer at UC Davis. In 2008, he led the team to the second round of the NCAA Tournament for the first time in school history.[2]
After 25 games for San Jose and one goal, he was traded to Colorado Rapids in April 2010 in exchange for a second-round selection in the 2012 MLS SuperDraft.[6] Amarikwa made 31 league appearances for Colorado scoring three goals and was a member of the side that captured the 2010 MLS Cup.
Amarikwa was waived by Colorado in June 2012.[7] Shortly thereafter his rights were claimed through waivers by the New York Red Bulls. He spent two weeks training with New York but never signed, instead, New York traded Amarikwa to Toronto FC for a conditional draft pick on July 21.[8] He made his league debut for Toronto in a 2–0 home defeat to Houston Dynamo on July 28.[9] Amarikwa scored his first goal for Toronto in CONCACAF Champions League play against Santos Laguna in a 3–1 home defeat.[10]
On August 8, 2018, Amarikwa was traded by the Earthquakes to Montreal Impact in exchange for Dominic Oduro.[15] He made his debut for Montreal on August 11, 2018, in a game against Real Salt Lake.[16]
On March 1, 2019, after speculation and Amarikwa appearing at D.C. United practices, Quincy Amarikwa signed with D.C. United.[17] Amarikwa scored his first goal for D.C. United in a friendly against Real Betis on May 22, 2019.[18] Amarikwa then scored his first D.C. United MLS goal against the New England Revolution on July 12, 2019. His goal equalized the game 2-2.[19] His contract with D.C. United ran out after the 2019 season.[20]
Amarikwa is a member of the UC Davis Hall of Fame.[23] While studying there, Quincy Amarikwa met his wife Sirena Amarikwa; they were engaged in 2016 while Sirena was pursuing her professional track career, and wed in January 2017.[24] They have two sons, Sir Amarikwa and Lord Amarikwa.[25]
Amarikwa and Ross LaBauex co-own a brand called Perfect Soccer, a Black news source for soccer.[26] He is also Founder and Director of Strategic Partnerships for Black Players for Change, serving as interim director when the organisation was launched.[citation needed]