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.
03 - Beat softened butter and granulated sugar in a large bowl until light and fluffy, approximately 3-4 minutes.
04 - Beat in eggs one at a time, fully incorporating each before adding the next. Mix in vanilla extract.
05 - Alternately add flour mixture and buttermilk to the butter mixture, beginning and ending with flour. Mix until just combined.
06 - Divide batter evenly between prepared pans. Bake for 22-25 minutes until a toothpick inserted in the center comes out clean. Cool in pans for 10 minutes, then turn out 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 - Whip cold heavy cream, powdered sugar, and vanilla extract in a chilled bowl until stiff peaks form.
09 - Place one cooled cake layer on a serving plate. Spread half the macerated strawberries and juices over the cake, then top with half the whipped cream. Repeat with remaining cake layer, strawberries, and whipped cream.
10 - Refrigerate assembled cake for at least 1 hour before slicing to allow flavors to meld and layers to set.