Bring 3 to 4 quarts of salted water to a boil for the pasta. While the water comes to a boil, prepare the shrimp.
Season shrimp with ¼ teaspoon salt and ¼ teaspoon pepper, stir to combine.
In a large sauté pan, heat 1 tablespoon of oil over medium heat.
Add sliced zucchini and sauté for 4 minutes, or until just tender.
Add the sliced grape tomatoes and sauté for 2 minutes, until just beginning to soften.
Add ¼ teaspoon salt to the vegetables and stir to combine. Transfer to a medium-sized bowl and reserve.
Add 2 tablespoons of oil to the pan, and turn heat to medium-low.
Add garlic and red pepper flakes, stir and cook for 2 minutes to ensure that the garlic does not brown or burn. You want the garlic to cook slowly and the flavors to infuse into the oil, turn heat to low if needed.
Keeping the heat on medium-low, add the seasoned shrimp. Cook for about 2 to 3 minutes on each side, or until just pink in color.
Add lemon juice and zest to the pan, stir to combine.
Add the cooked zucchini and tomatoes back to the pan, and stir to combine with the shrimp.
Add the pasta to the boiling water and cook pasta according to manufacturer's directions, until tender.
Drain the pasta and toss with the shrimp and vegetables. Add more salt and pepper as desired. Sprinkle with chopped parsley.