In a medium bowl, add thawed shrimp and buttermilk. Set aside.
In a small bowl, mix sweet chili sauce, Sriracha and mayonnaise together and set aside.
Add 2 inches of oil to a deep fryer, saucepan or small skillet and heat to 375°F. Set aside a wire cooling rack.
In a soup bowl, mix together cornstarch, breadcrumbs and baking soda with a fork.
Remove shrimp from the buttermilk and dredge one-by-one in the cornstarch mixture until coated.
Shake off the excess cornstarch and carefully drop 3-4 shrimp into the hot oil.
Fry about 2-3 minutes or until golden brown (see note) and then remove with slotted spoon to prepared cooling rack. Repeat for remaining shrimp.
Place shrimp on a serving plate and drizzle Bang Bang sauce on top. Serve and enjoy!