For the first time in an international championship, Dschojs Koba competed over 400 meters at the European Youth Olympic Festival 2013 in Utrecht and won the silver medal there. In 2014 she took part in the Youth Olympic Games in Nanjing over 200 meters and won the silver medal again this time. At the U18 World Championships in Cali , she started over 400 meters and made it to the semi-finals. In 2016, she was part of the relay for the World Indoor Championships in Portland , where Ukraine finished fifth. At the U20 World Championships in Bydgoszcz , she finished fifth overall in the relay and reached eighth place in the individual competition.
In 2017 she was eliminated in the semi-finals of the U20 European Championships in Grosseto over 400 meters. She won the gold medal with the Ukrainian relay. The relay set a new Ukrainian junior record with 3: 32.82 minutes.
Personal bests
100 m: 11.97 s (+1.2 m / s), October 1, 2014 in Kropywnyzkyj