01 - Preheat oven to 350°F. Grease and line two 8-inch round cake pans with parchment paper.
02 - Whisk together flour, baking powder, baking soda, and salt in a medium bowl until well combined.
03 - In a large bowl, beat softened butter and granulated sugar with an electric mixer until light and fluffy, about 3 minutes.
04 - Beat in eggs one at a time, mixing well after each addition. Stir in vanilla extract.
05 - Alternately add flour mixture and buttermilk to the butter mixture, beginning and ending with flour. Mix until just incorporated, being careful not to overmix.
06 - Divide batter evenly between prepared pans. Bake for 22 to 25 minutes until a toothpick inserted into the center comes out clean. Cool in pans for 10 minutes, then invert onto wire racks to cool completely.
07 - Combine sliced strawberries, granulated sugar, and lemon juice in a bowl. Let stand for at least 20 minutes, stirring occasionally to release natural juices.
08 - In a chilled bowl, whip heavy cream, powdered sugar, and vanilla extract with an electric mixer until stiff peaks form.
09 - Place one cooled cake layer on a serving plate. Spread half the macerated strawberries and their juice over the layer, then top with half the whipped cream. Place second cake layer on top. Finish with remaining strawberries and whipped cream, spreading cream to cover the top and sides.
10 - Refrigerate assembled cake for at least 1 hour before slicing to allow flavors to meld and cake to set.