X0206 3 2022-06-01 1 0001829802 Sensei Biotherapeutics, Inc. SNSE 0001932215 Gallagher Patrick Stephen C/O SENSEI BIOTHERAPEUTICS, INC. 451 D STREET, SUITE 710 BOSTON MA 02210 0 1 0 0 Chief Business Officer Exhibit 24 - Power of Attorney /s/ Mark Ballantyne, Attorney-in-Fact 2022-06-03