Making her senior international debut, she won gold at the Crystal Skate of Romania in October and at the Denkova-Staviski Cup in November.

Feigin started the season by competing on the 2019–20 ISU Junior Grand Prix, finishing eleventh at 2019 JGP United States.

She would go on to win medals in several minor senior international events, including bronze at the 2019 Denis Ten Memorial Challenge and gold at the 2019 Denkova-Staviski Cup.

[7] With the pandemic continuing to limit international travel, Feigin competed at a European-only 2020 CS Budapest Trophy, winning the bronze medal, her first on the Challenger series.

[9] In her only event of the fall season, Feigin finished in fifth at the 2021 CS Denis Ten Memorial Challenge before coming twentieth at the 2022 European Championships to start the new year.

[10] Named to the Bulgarian team for the 2022 Winter Olympics, Feigin placed twenty-second in the short program of the women's event, qualifying for the free skate.

[10] Feigin started the season by competing at the 2023 Trophée Métropole Nice Côte d'Azur and the 2023 Denkova-Staviski Cup, winning bronze and gold, respectively.

[10][13] At the 2024 World Championships in Montreal, Quebec, Feigin placed twenty-sixth in the short program, failing to advance to the free skate segment.