At the 2017 World Aquatics Championships in Budapest, Hungary, Shymanovich competed in the men's 50 metre breaststroke event.

[1][2] Competing on the global level at the 2018 World Short Course Championships in Hangzhou, China, Shymanovich won his first medal of the meet in the 100 metre breaststroke, finishing in a time of 56.10 seconds that was nine hundredths of a second behind the gold medalist and then-world-record-holder in the event Cameron van der Burgh of South Africa to earn the silver medal.

[3] In his next individual event, the 200 metre breaststroke, Shymanovich placed twelfth overall with a time of 2:04.85 in the prelims heats, which did not advance him to the final.

[6][7] At the 2020 European Aquatics Championships held in Budapest, Hungary in May 2021 and conducted in long course metres, Shymanovich competed in the 50 metre breaststroke winning the silver medal in the event with a time of 26.55 seconds, which was less than four tenths of a second behind the gold medalist in the event, Adam Peaty of Great Britain.

[8] Shymanovich won the gold medal and tied the world record of 25.25 seconds in the 50 metre breaststroke, set in 2009 by Cameron van der Burgh of South Africa, on the last day of the 2021 European Short Course Swimming Championships, held at the Palace of Water Sports in Kazan, Russia in November.

[35][36] Shymanovich won the gold medal in the final of the 100 metre breaststroke in a Championships record time of 55.70 seconds.

[38] On the third day of competition, Shymanovich ranked tenth overall in the prelims heats of the 200 metre breaststroke with a 2:04.99 and did not qualify for the final.

[39] In the evening, Shymanovich split a 24.93 for the breaststroke leg of the 4×50 metre mixed medley relay in the final, helping achieve a fifth place finish of 1:37.97.

[40] Day five, Shymanovich qualified for the semifinals of the 50 metre breaststroke ranking first in the prelims heats with a time of 25.77 seconds.

"[48] At the 2023 Russian National Championships, held starting 16 April at the Palace of Water Sports in Kazan, Russia, Shymanovich ranked first in the semifinals of the 100 metre breaststroke with a time of 59.35 seconds and qualified for the final on day two.