After graduating from George Walton Comprehensive High School,[citation needed] Kieboom played college baseball at Clemson University.\n', '

The Washington Nationals selected Kieboom in the fifth round of the 2012 Major League Baseball Draft. He played for the Auburn Doubledays in the Class A-Short Season New York-Penn League in 2012, batting .258 with 20 runs batted in (RBIs) in 41 games. He suffered an injury that required him to undergo ulnar collateral ligament reconstruction, popularly known as "Tommy John surgery" – a rarity for a catcher – in 2013, forcing him to scrap plans to play for the Netherlands in the 2013 World Baseball Classic and to miss virtually the entire 2013 season, although he did play in four games with the Gulf Coast League Nationals in the rookie-level Gulf Coast League late in the year, going 2-for-6 at the plate with one RBI. He thus played a small part in a year in which the Gulf Coast League Nationals finished their regular season with a record of 49-9, giving them an .845 winning percentage that was the highest winning percentage for a full regular season ever achieved by a Minor League Baseball team based in the United States. The Nationals then won all three of their playoff games, defeating the Gulf Coast League Pirates in a single-game semifinal playoff and sweeping the Gulf Coast League Red Sox in the best-of-three league championship series, to become the 2013 Gulf Coast League champions.\n', '

Kieboom played for the Hagerstown Suns in the Class A South Atlantic League in 2014, appearing in 87 games and hitting .309, with 61 RBIs and nine home runs, the first home runs of his professional career. In the fall of 2014, he played for the Mesa Solar Sox in the Arizona Fall League, batting .324 in 10 games with a home run and seven RBIs. He spent 2015 with the Potomac Nationals in the Class A-Advanced Carolina League, where he played in 71 games and hit .248 with two home runs and 21 RBIs. He returned to the Arizona Fall League in the fall of 2015, playing in 13 games for the Salt River Rafters and hitting .238, with two homers and seven runs driven in. The Washington Nationals added him to their 40-man roster in November 2015.\n', '

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