Preheat oven to 350.
Prepare two 8 inch round baking pans, line the bottoms with parchment paper, then spray with baking spray or butter and flour.
Sift the flour, sugar, cocoa, baking soda, powder and salt into the bowl of an electric mixer fitted with a paddle attachment. Mix on low speed until combined.
In a separate bowl add eggs, oil, buttermilk, and vanilla, mix to combine.
With the mixer on low speed slowly add the wet ingredients to the dry.
With the mixer still on low, add the coffee until just combined, scraping the bottom of the bowl with a spatula.
Pour batter into prepared pans and bake for 30 to 40 minutes or until a cake tester comes out clean.
Cool in the pans for 30 minutes, then turn out onto wire rack.
Remove parchment and cool completely.