[1] In 2023, at the Russian Championships in Kazan, he became a champion in the relay for the first time in his career.

In December 2023, at the Vladimir Salnikov Cup, he set a junior European and Russian record in the 50-meter backstroke — 22.75.

In 2024, at the Russian Championships in Kazan, he won two gold and one bronze medal.

In the mixed 4x50m medley relay, where Lifintsev swam the first leg, the team of neutral athletes set a European record (1:35.36).

In the men's 4 × 100 m medley relay, the team of neutral athletes, with Lifintsev in the first leg, set a world record in the final (3:18.68).