Bring a small pot of salted water to a boil and cook the whole wheat linguine according to package directions until al dente.
While the pasta cooks, peel and devein the shrimp, then pat them completely dry with a paper towel.
In a large skillet over medium heat, melt the ghee until it begins to shimmer.
Add the minced garlic and red pepper flakes to the skillet, sautéing for 1 minute until highly fragrant but not browned.
Add the shrimp to the skillet in a single layer, seasoning with sea salt and black pepper.
Cook the shrimp for 2 minutes per side until they turn opaque and pink, then remove them from the pan and set aside.
Add the zucchini noodles and cooked linguine to the same skillet, tossing for 1-2 minutes to soften the zucchini slightly.
Return the shrimp to the pan and stir in the lemon juice, lemon zest, and fresh chopped parsley.
Toss everything together until well combined and coated in the garlic butter sauce, then serve immediately.