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 thoroughly combined.
03 - Beat softened butter and granulated sugar in a large bowl until light and fluffy, approximately 3-4 minutes.
04 - Add eggs one at a time, beating well after each addition. Mix in vanilla extract until fully incorporated.
05 - Alternate adding flour mixture and buttermilk to the butter mixture, beginning and ending with flour. Mix until just combined, being careful not to overmix.
06 - Divide batter evenly between prepared pans. Bake for 22-25 minutes or 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 juices and create a syrup.
08 - Using a chilled bowl and beaters, whip heavy cream with powdered sugar and vanilla extract until stiff peaks form.
09 - Place one cake layer on a serving plate. Spread half the macerated strawberries and 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 to cover top and sides.
10 - Refrigerate assembled cake for at least 1 hour before slicing to allow flavors to meld and cake to set.