Preheat oven to 350°F. Grease a 10–12 cup Bundt pan with butter, then dust with cocoa. Tap out excess.
Whisk flour, sugar, cocoa, baking powder, baking soda, salt, and espresso powder in a large bowl.
Whisk sour cream, buttermilk, liquid eggs, oil, and vanilla in a separate bowl until smooth.
Pour wet ingredients into dry. Stir gently until no dry pockets remain; do not overmix.
Stream in hot coffee and whisk just until the batter is evenly combined. The batter will be thin.
Fold in chocolate chips. Scrape batter into the prepared pan and smooth the top.
Bake 50–55 minutes, until a tester comes out with a few moist crumbs.
Cool in pan 15 minutes. Loosen edges, invert onto a rack, and cool completely.
Warm cream until steaming. Pour over chopped chocolate and butter; rest 2 minutes, then stir until glossy.
Spoon glaze over the cooled cake, letting it drip down the sides. Let set 15 minutes before slicing.