An airfoil assembly for a gas turbine engine comprising: an airfoil including an airfoil section extending from a root section , the airfoil section extending between a leading edge and a trailing edge in a chordwise direction (X) and extending between a tip portion and the root section in a radial direction (R), and the airfoil section defining a pressure side and a suction side separated in a circumferential direction (T); a platform including a first and second platform portions (175-1, 175-2) attached to the root section , wherein each of the first and second platform portions (175-1, 175-2) includes a shoe section and a platform section extending in the circumferential direction from the shoe section to establish a gas path surface (GS), and the shoe sections of the first and second platform portions (175-1, 175-2) are circumferentially arranged on opposed sides of the root section to capture the root section in a root cavity established between the shoe sections , wherein the shoe section includes a sidewall having a complementary geometry to the root section and a base wall extending from the sidewall to establish a floor of the root cavity , and the root section is dimensioned to sit on the floor of the shoe section in an installed position; and wherein the root section comprises a first material, the platform comprises a second material that differs from the first material, and one of the first and second materials is a metallic material, characterized in that : the shoe section includes an axial wall having a major component in the circumferential direction (T) and extending inwardly from the sidewall to bound the root cavity in the chordwise direction, wherein the axial wall of the first platform portion (175-1) and the axial wall of the second platform portion (175-2) are arranged to establish an interface having a serpentine geometry. an airfoil including an airfoil section extending from a root section , the airfoil section extending between a leading edge and a trailing edge in a chordwise direction (X) and extending between a tip portion and the root section in a radial direction (R), and the airfoil section defining a pressure side and a suction side separated in a circumferential direction (T); a platform including a first and second platform portions (175-1, 175-2) attached to the root section , wherein each of the first and second platform portions (175-1, 175-2) includes a shoe section and a platform section extending in the circumferential direction from the shoe section to establish a gas path surface (GS), and the shoe sections of the first and second platform portions (175-1, 175-2) are circumferentially arranged on opposed sides of the root section to capture the root section in a root cavity established between the shoe sections , wherein the shoe section includes a sidewall having a complementary geometry to the root section and a base wall extending from the sidewall to establish a floor of the root cavity , and the root section is dimensioned to sit on the floor of the shoe section in an installed position; and wherein the root section comprises a first material, the platform comprises a second material that differs from the first material, and one of the first and second materials is a metallic material, characterized in that : the shoe section includes an axial wall having a major component in the circumferential direction (T) and extending inwardly from the sidewall to bound the root cavity in the chordwise direction, wherein the axial wall of the first platform portion (175-1) and the axial wall of the second platform portion (175-2) are arranged to establish an interface having a serpentine geometry. <EOS>