A product of the
Dynamo Kyiv academy, Kostyshyn joined
Dnipro in August 2014. On 5 December 2022, it was announced that Kostyshyn would join
USL Championship side
El Paso Locomotive for their 2023 season. Kostyshyn was awarded the Fan's Offensive Player of the Year Award, was named to the league Team of the Week three times, and won the league's Goal of the Week once. On 1 November 2023, it was announced that he would be departing El Paso ahead of the 2024 season. In 2025, sign for
FC Drita and was on contract there for the rest of the season and in 2026 he signed for
Athletic Club Boise in
USL League One ahead of their inaugural season. ==Personal life==