[3][4] He attended Campolindo High School, where he played baseball, pitched a no-hitter, and was named Most Valuable Pitcher in the Diablo Foothill Athletic League (DFAL) in 2003–04.

[1] For his college career, he started 33 of 46 games, going 17–11 with 167 strikeouts and a 2.61 ERA in three seasons in which he threw a plus fastball, slider, and change-up.

[5][13] Poreda was named Pioneer League Pitcher of the Week on September 4, 2007, while pitching for the Rookie-level Great Falls White Sox.

[12] In 2008 while playing for the Peoria Saguaros of the Arizona Fall League, Poreda was named one of the AFL Rising Stars.

[12] On May 21, 2009, the San Diego Padres struck a 4-for-1 deal with the White Sox for Jake Peavy, which reportedly included Poreda and Chicago's other top pitching prospect, Clayton Richard.

[19] He went 1–0 with a 2.45 ERA and 12 strikeouts in 11 innings in 10 relief appearances with the White Sox before being optioned back to the minors on July 21.

[20] On July 31, 2009, Poreda was traded along with Clayton Richard, Adam Russell, and Dexter Carter to the San Diego Padres for Jake Peavy.

Poreda spent the entire 2010 season in the Padres' minor league system, splitting the year between the San Antonio Missions and the Beavers.

[23] Poreda underwent Tommy John surgery on his left elbow in October 2012, and as a result missed pitching in all of 2013.

[27] After a spring training with the Rangers in 2014 in which he pitched 8.1 innings and walked only one batter, he was assigned to the Round Rock Express in the AAA Pacific Coast League.

[31] On November 20 the Rangers placed Poreda on unconditional release waivers and he signed a contract with the NPB team for 2015.

[33][34] In 2015, his first season in Japan with the Yomiuri Giants, Poreda appeared in 24 games, compiling an 8-8 record with a 2.94 ERA and a 1.21 WHIP.

Plagued by injuries in his second season with the Giants in 2016, Poreda made just five starts, posting a 1-3 record and a 4.00 ERA.