Alexandra Feigin made a significant impact on the international figure skating scene with her senior international debut in October 2018, earning a gold medal at the Crystal Skate of Romania. This was swiftly followed by another gold at the Denkova-Staviski Cup in November 2018. Feigin, who commenced training under coaches Andrei and Ina Lutai in 2010, began her competitive international career representing Bulgaria with her debut in the ISU Junior Grand Prix (JGP) series in August 2016. She showcased early promise by qualifying for the final segment at the 2018 World Junior Championships held in Sofia, Bulgaria, where she finished fifteenth overall.
She represented her country at the Olympic Games, finishing twenty-third overall. Feigin maintained her competitive momentum into 2022, securing a gold medal at the Denkova-Staviski Cup and a fourth-place finish at the CS Denis Ten Memorial Challenge. The following year, she earned a bronze medal at the 2023 Trophée Métropole Nice Côte d’Azur and another gold at the Denkova-Staviski Cup. Her consistency at major events included a twelfth-place finish at the 2023 Winter World University Games, sixteenth at the 2023 European Championships, and twenty-fourth at the 2023 World Championships.
In 2024, Feigin continued her robust schedule, achieving a silver medal at the Sonia Henie Trophy and a gold at the Bosphorus Cup, alongside a silver at the Denkova-Staviski Cup. She placed eighteenth at the European Championships in Kaunas, Lithuania, and twenty-sixth at the World Championships in Montreal, Quebec. Looking ahead to 2025, she secured a gold medal at the Sofia Trophy and a bronze at the Trophée Métropole Nice Côte d’Azur. Her performance at the 2025 World Championships in Boston, Massachusetts, where she finished twenty-first, notably secured a quota for Bulgaria at the 2026 Winter Olympics, underscoring her ongoing impact on the international stage.