For the pesto, pulse kale, spinach, basil/parsley, almonds, olive oil, water, salt, garlic, and lemon juice in a food processor or blender until mostly smooth. This will yield about 2 cups; set aside 1 cup for this recipe.
Heat 1 tablespoon butter or oil over medium-high heat. Add the shrimp and toss with red pepper flakes, paprika, and garlic powder until well coated. Sauté until fully cooked and no longer translucent, about 3-5 minutes.
Cut the zucchini into long noodle-like shapes using a spiralizer or vegetable peeler.
Toss the zucchini noodles with the reserved 1 cup of pesto until evenly coated.
Top the pesto-coated zucchini noodles with the cooked spicy shrimp.
Serve immediately for the best flavor and texture.