Preheat the oven to 350°.
Use butter to grease 2 round cake pans, line with the parchment paper and then butter and flour the pans.
In the bowl of an electric mixer, sift the flour, sugar, cocoa, baking soda, baking powder and salt. Mix on low speed until combined.
In another bowl, combine buttermilk, oil, eggs and vanilla. With the mixer on low speed, slowly add the wet ingredients to the dry and then add the coffee, mixing until just combined.
Scrape the bottom of the bowl with a rubber spatula before dividing batter between the prepared pans.
Bake for 35 to 40 minutes, until a toothpick tests clean. Cool in the pan for 30 minutes and then turn them out onto a cooling rack and cool completely.