Preheat the oven to 350°F, grease three 8" cake pans (or four 6" pans) with non-stick spray and line with parchment.
In the bowl of a stand mixer fitted with the paddle attachment, combine the sugar, flour, cocoa, baking soda, baking powder and salt. Mix on low until dry ingredients are thoroughly combined.
On low speed add eggs, buttermilk, coffee, oil and vanilla.
Once everything is combined beat on medium speed for 1 minute.
Divide batter evenly between the three cake pans.
Bake for 30-35 minutes, or until wooden toothpick inserted in center comes out clean.
Transfer pans to wire rack and let cool completely.