[1] He represented his nation Kazakhstan at the 2008 Summer Olympics, and has won a career total of four medals (three golds and one silver) in a major international competition, spanning three editions of the Asian Indoor Games (2005, 2007, and 2009).

[2][3] Gordiyenko competed for the Kazakh squad in a medley double at the 2008 Summer Olympics in Beijing with five days apart from each other.

[4][5] In the 400 m individual medley, Gordiyenko rallied from fourth towards the freestyle leg in the opening heat to fight off against three fastest swimmers in a sprint challenge, but could not catch the hard-charging Croatian Nikša Roki to finish only with a second-place time and twenty-sixth overall in 4:25.20.

[6] Four nights later, in the 200 m individual medley, Gordiyenko touched out Germany's Markus Deibler on the final stretch by nearly half of his body length to save the seventh spot in 2:03.92, but fell short for the semifinals with a thirty-seventh overall placement from the prelims.

[7] This biographical article related to a Kazakhstani swimmer is a stub.