Preheat oven to 325 degrees F. Line two 8 inch cake pans with parchment paper.
Put coffee, orange juice, vanilla and butter in a saucepan and heat until all the butter is melted. Whisk in the cocoa powder. Take off the heat, and sugar and brown sugar and whisk until dissolved.
Set mixture aside to cool and in a separate bowl mix together the flour, baking soda and salt.
Whisk the eggs and vanilla in a small bowl and temper the eggs by pouring a small amount of the melted cocoa butter mixture into the eggs while whisking. Add the cocoa mixture into the eggs a tablespoon at a time, whisking constantly. After about 5 tablespoons it is safe to add the egg mixture to the rest of the cooling cocoa mixture. Mix well.
Add this chocolate and egg mixture to the bowl with the flour and baking soda and whisk until combined.
Evenly divide the batter between the 2 cake pans and bake for 35 minutes or until a toothpick inserted into the center comes out clean.
Cool layers before flipping out of the pans.