Bring a large pot of salted water to a boil and cook pasta according to package instructions until al dente.
Reserve 1/4 cup of pasta water, then drain and set aside.
In a bowl, season shrimp with salt, black pepper, and paprika.
Coat each shrimp lightly in cornstarch, then dip into buttermilk, and finally coat with panko breadcrumbs.
Heat vegetable oil in a skillet over medium heat and cook shrimp in batches for 2-3 minutes per side until golden brown and crispy. Remove and drain on paper towels.
In a bowl, whisk together mayonnaise, sweet chili sauce, sriracha, honey, rice vinegar, and garlic powder until smooth.
In the same skillet, melt butter and sauté garlic and red pepper flakes for 30 seconds.
Add the cooked pasta and pour in the bang bang sauce, tossing to coat.
If the sauce is too thick, add reserved pasta water to loosen it.
Arrange the crispy shrimp on top of the pasta.
Garnish with chopped green onions and sesame seeds.
Serve immediately and enjoy!