Preheat oven to 350 F. Butter and flour two 8 or 9 inch round cake pans.
Sift together the flour, sugar, cocoa powder, baking soda, baking powder, and salt. Set aside.
In the bowl of an electric mixer, combine the buttermilk, oil, eggs, and vanilla. With the mixer on low, slowly add the dry ingredients to the wet to combine. Slowly add the hot coffee until just combined.
Pour the batter into the prepared pans and bake for 35-40 minutes, or until a toothpick comes out clean.