Pre-heat oven to 350 degrees. Prepare three 6" cake pans by spraying with cooking spray and lining the bottom with parchment.
In the bowl of your stand mixer fitted with the whisk attachment, combine flour, sugar, cocoa, baking soda, baking powder, and salt and mix together.
Add the eggs, coffee, buttermilk, oil, and vanilla and mix on medium speed for a couple minutes.
Divide the batter between the three prepared pans.
Bake for 40-45 minutes. Allow to cool for 10 minutes in the pans and then transfer to wire rack to fully cool.