In a large pot, bring salted water to a rolling boil. Add the linguine or spaghetti and cook according to the package instructions until al dente. Before draining, reserve 1/2 cup of the starchy pasta water to use later, then drain the pasta and set aside.
In a spacious skillet, melt 2 tablespoons of unsalted butter along with 2 tablespoons of olive oil over medium heat. Once the mixture is hot and bubbling, add the minced garlic. Sauté for approximately 1 minute or until fragrant, being cautious not to let it burn.
Add the peeled and deveined shrimp to the skillet, along with red pepper flakes, sea salt, and freshly cracked black pepper. Cook for about 2-3 minutes per side, or until the shrimp turn a lovely pink hue and are opaque throughout.
Once the shrimp are thoroughly cooked, pour in the lemon zest and juice, stirring to ensure all flavors meld together. If the mixture appears dry, incorporate a few tablespoons of the reserved pasta water.
Gently add the drained pasta to the skillet with the shrimp, using tongs or a spatula to toss and coat the noodles evenly in the sauce. Stir in the remaining 2 tablespoons of butter and adjust the seasoning as necessary.
Dish the Zesty Lemon Garlic Shrimp Scampi into bowls or on plates. For a finishing touch, sprinkle with freshly chopped parsley and add a light dusting of grated Parmesan cheese if desired.