[10] Seifert competed on the pommel horse and parallel bars at the 2021 European Championships but did not advance to any finals.

[16] He then comepetd at the Swiss Cup, a mixed pairs competition, alongside Lena Bickel, and they finished fourth.

[17] Seifert won a silver medal on the parallel bars at the Osijek World Challenge Cup behind Turkey's Ferhat Arıcan.

[23] Due to several mistakes at the World Championships, the Swiss team only finished 20th, and Seifert missed out on the all-around final.

[27] He repeated his fifth-place all-around finish from the previous European Championships, this time less than half of a point away from the bronze medal.

[29][30] Then at the Lenzburg Friendly, he helped the Swiss team finish second to Spain, and he won the all-around silver medal behind Néstor Abad.

[32] He also won the all-around gold medal at the Magglingen Friendly and helped the Swiss team win.

[37] He withdrew from the Swiss Cup and the Arthur Gander Memorial due to ongoing back issues.

[38] In early April, Seifert competed at the Osijek World Challenge Cup where he won bronze on the parallel bars behind Lukas Dauser and Illia Kovtun.

[39] Later that month, he competed the 2024 European Championships and won bronze on parallel bars behind Kovtun and Marios Georgiou.