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. Set aside.
03 - In a large bowl, beat softened butter and granulated sugar until light and fluffy, approximately 3-4 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 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 until a toothpick inserted in 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.
08 - In a chilled bowl, whip heavy cream with powdered sugar and vanilla extract until stiff peaks form.
09 - Place one cooled cake layer on serving plate. Spread with half the strawberries and juice, then half the whipped cream. Top with second cake layer, remaining strawberries, and remaining whipped cream.
10 - Refrigerate assembled cake for 1 hour before slicing to allow flavors to meld and cake to set.