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 - 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, incorporating fully after each addition. Mix in vanilla extract.
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 before transferring to 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 syrupy consistency.
08 - Using a chilled bowl, whip heavy cream, powdered sugar, and vanilla extract until stiff peaks form.
09 - Place one cooled cake layer on a serving plate. Spread half the strawberry mixture with juices over the layer, then top with half the whipped cream. Add the second cake layer. Repeat with remaining strawberries and whipped cream, spreading cream over the top and sides.
10 - Refrigerate assembled cake for 1 hour before slicing to allow flavors to meld and layers to set.