Sift flour, cocoa, baking soda, and baking powder in mixing bowl. Stir in sugar and salt.
With mixer running, add eggs, buttermilk, coffee, vegetable oil, and vanilla.Beat on medium for about 5 minutes, scraping bowl occasionally, until oil is well-combined in batter.Batter will be very thin. Divide batter evenly between the two cake pans.
Bake 30-35 minutes or until toothpick inserted in center comes out clean.
Cool 10 minutes, then remove from pans.