01 - Preheat oven to 350°F. Grease and line two 8-inch round cake pans with parchment paper.
02 - In a medium bowl, whisk together flour, baking powder, baking soda, and salt until well combined.
03 - In a large bowl, beat softened butter and granulated sugar with an electric mixer 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, taking care not to overmix.
06 - Divide batter evenly between prepared pans. Bake for 22-25 minutes or until a wooden toothpick inserted in 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 - In a chilled bowl, whip heavy cream with powdered sugar and vanilla extract until stiff peaks form, taking care not to overwhip.
09 - Place one cooled cake layer on a serving plate. Spoon half the macerated strawberries and their juice over the cake, then spread with half the whipped cream. Repeat with second cake layer, remaining strawberries, and remaining whipped cream.
10 - Refrigerate assembled cake for at least 1 hour before slicing to allow flavors to meld and cake to set.