Prior to playing professionally, Caminero attended Colegio Buen Pastor in the Dominican Republic. He was signed by Marlins scout Fred Ferreira and began his professional career with the DSL Marlins in 2006, with whom he went 0–1 with a 7.36 ERA in 18 relief appearances. In 2007, again with the DSL Marlins, Caminero went 2–3 with a 2.83 ERA in 16 games (four starts), striking out 48 batters in 47 2/3 innings. He moved stateside for 2008, splitting the season between the GCL Marlins (14 games), Jamestown Jammers (six games) and Greensboro Grasshoppers (one game), going a combined 1–1 with a 2.60 ERA in 21 relief appearances, striking out 31 batters in 27 2/3 innings. In 2009, he pitched for the Jammers (15 games), Grasshoppers (10 games) and Jupiter Hammerheads (two games), posting a combined 3–1 record with a 5.53 ERA in 27 appearances, striking out 61 batters in 40 2/3 innings. In 2010, he pitched for the Grasshoppers and went 5–2 with a 3.01 ERA in 48 appearances, finishing 22 games and striking out 97 batters in 74 2/3 innings. From 2011 to 2012, he compiled a 1–0 record with 3 saves in 32 games. he had a 9.00 ERA in 2011 and a 1.64 ERA in 2012 with Jupiter and Jacksonville. He started the 2013 season with Jacksonville. His 2013 stats in the minor were a 3.48 ERA, a 1.01 WHIP, 69 strikeouts, and 6–2 record with 5 saves playing for both the Jacksonville Suns and the New Orleans Zephyrs.\n', '

The Marlins promoted Caminero to the major leagues on August 16, 2013. He made his Major League debut on the same day, throwing a scoreless inning while striking out one and hitting a batter. He made 3 more appearances before being sent to Triple A. He was recalled back on September 1 when rosters expanded. His 2013 pitching statistics with the Marlins were a 2.77 ERA, a 1.00 WHIP, 20 strikeouts, and 1 hold in 13 innings pitched. He started the 2014 season with the Marlins Triple A team, the New Orleans Zephyrs, but was called up when Jacob Turner was put on the DL with a shoulder injury. On April 21, after allowing a game-winning home run to Jayson Werth, he was sent back down to New Orleans. He was called back up in May, but only made one appearance before being sent back down. With the Marlins he has a 10.80 ERA, a 1.80 WHIP, 8 strikeouts, and a 0–1 record. His 2014 minor league stats are a 4.86 ERA, a 1.59 WHIP, 79 strikeouts, and a 4–1 record with 10 saves for New Orleans.\n', '

Caminero was traded to the Pittsburgh Pirates on February 4, 2015. \n', '

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