Feldeine played basketball at Cardinal Hayes High School, before moving to Quinnipiac University. In his high school career, Feldeine was nominated to play in the McDonald's All-American Game, was twice named to the All-Bronx Burroughs First-Team, was named to the All-New York City Second-Team, and he was also named to the All-New York State Second-Team.
Feldeine played college basketball at Quinnipiac University, with the Quinnipiac Bobcats. In his junior college season, during the 2008–09 season, Feldeine was named the NEC's Most Improved Player, and was also selected to the All-NEC First-Team, after being the Northeast Conference's top scorer. During his junior year, he was also twice selected as the NEC Player of the Week, and he was also selected to the NABC's All-District 18 Second-Team.
During his senior college season, in 2009–10, Feldeine was selected to both the All-NEC First-Team, and the NABC All-District 18 First-Team.
Feldeine started his pro career in 2010 in Spain, with the Spanish club CB Breogán, where he played for two seasons, becoming one of the top scorers of the LEB Oro (Spanish 2nd Division).
In May 2012, Feldeine signed with the 1st-tier Spanish ACB League team Mad-Croc Fuenlabrada, on a contract through 2015.
On 8 August 2014, he inked a one-year-deal to play in Italy, with the Italian League club Pallacanestro Cantù. On May 31, 2015, he signed with the Puerto Rican club Vaqueros de Bayamón, for the rest of the 2015 BSN season.
On August 18, 2015, Feldeine signed a one-year deal to play in Greece with Panathinaikos of the Greek League and the EuroLeague. In February 2016, he extended his contract through 2018.
On August 2, 2017, Feldeine signed a two-year deal with the Serbian club Crvena zvezda.
Feldeine has also been a member of the senior men's Dominican Republic national basketball team. With the Dominican Republic's senior national team, he has played at the following international tournaments: the 2013 Marchand Continental Cup, the 2013 FIBA Americas Championship, the 2014 FIBA Basketball World Cup, and the 2015 FIBA Americas Championship.
Note: The EuroLeague is not the only competition in which the player participated for the team during the season. He also played in domestic competition, and regional competition if applicable.