Born in
Torgau, he initially specialised in the
high jump and was the 2008 German
youth champion in the event. He also competed in the
combined events youth championships, coming seventh outdoors and fourth indoors. In 2009 he was
indoor heptathlon runner-up at the national junior championships and also came third in the high jump. Outdoors, he placed third in the junior long jump, won in the junior decathlon section of the
Mehrkampf-Meeting Ratingen, then claimed a bronze medal at the
2009 European Athletics Junior Championships in a personal best of 7639 points. The year after he won the German junior heptathlon title and improved his decathlon score to 7829 points. He placed sixth at both the
2010 World Junior Championships in Athletics and the
2011 European Athletics U23 Championships. The
2012 Thorpe Cup saw him reach new heights in the senior division. He scored over eight thousand points for the first time and won the competition with a total of 8130 points. He won his first national title in the event but did not gain selection for the
2012 London Olympics as national rivals
Rico Freimuth,
Pascal Behrenbruch, and
Jan Felix Knobel had all performed better on the decathlon circuit that year. Kazmirek ranked ninth in Europe that year. He opened the 2014 indoor season with a heptathlon best of 6083 points to win the German indoor title. This earned him his first senior international selection and he improved further at the
2014 IAAF World Indoor Championships, taking sixth overall with a total score of 6173. ==Personal bests==