Season the shrimp with salt, pepper and cayenne pepper. Set aside.
Heat up 4 quarts of water in pot and bring the water to boil. Add the salt and cook the spaghetti until al dente. Drain and set side. Save 1/2 cup of pasta water.
Heat up a skillet with olive oil and butter. Saute and stir the garlic slices and red chili flakes a few times before adding the shrimp. When the shrimp turn opaque, add the white wine, pasta water lemon juice and salt to taste. Cook the shrimp and reduce the sauce a little.
Add the spaghetti into the skillet, stir to combine well with the sauce. Add the chopped parley, mix well with the spaghetti. Serve immediately.