Samarin currently holds the world record for the highest scored element in single figure skating (21.12 points for a 4Lz+3T combination at the 2019 Rostelecom Cup) since the introduction of the -5/+5 GOE system in 2018.

[1] In the 2009–10 season, he won the novice event at the 2010 NRW Trophy in Dortmund, Germany, and the junior silver medal at the International Crystal Skate 2010 in Odintsovo, Russia.

At the Russian Championships, he finished eighth in his first senior appearance and then won the silver medal on the junior level.

At the 2014 Russian Championships, he placed thirteenth in seniors, landing his first triple Axel in competition in the free skate and then fourth at the junior level.

[5] He won bronze at his first Junior Grand Prix event of the season, in Courchevel, France, and then silver in Ostrava, Czech Republic.

Concluding his season, he placed sixth in the short, ninth in the free, and eleventh overall at the 2015 World Junior Championships in Tallinn, Estonia.

At Russian nationals, he ranked eighth on the senior level and won the silver medal as a junior, behind Dmitri Aliev.

He finished fourth at the 2016 World Junior Championships in Debrecen after winning a small silver medal for the short program and placing fifth in the free skate.

In March 2017, Samarin competed at the 2017 Junior Worlds, where he won the bronze medal after placing third in the short program and fourth in the free skate.

[6] Handicapped by an injury to his right foot, Samarin was off the ice for about four months and returned to full training beginning of September.

Samarin underwent knee surgery in May, was back on the ice in July, and started jumping again towards the end of August.

In his Grand Prix events, he placed fourth at 2018 Skate Canada and won the bronze medal at 2018 Internationaux de France.

At the 2019 Russian Championships, Samarin placed fourth in the short program after falling on an attempted quad toe loop.

[13] Samarin began the season with a fourth-place finish at the 2019 CS Ondrej Nepela Memorial before winning silver at the 2019 Shanghai Trophy.

In the short program, Samarin placed second behind Nathan Chen, having made only a slight error on his triple Axel in a segment where most other competitors either popped or fell at least once.

[15] At the 2019 Rostelecom Cup, Samarin placed first in the short program despite falling on his quad flip and putting a foot down on his triple Axel.

[26] Returning to competition at the 2021 Russian Championships, Samarin was fifth in the short program after falling on his quad Lutz and underrotating his triple Axel attempt.