In a large mixing bowl, toss the shrimp, 1 Tablespoon of cajun seasoning, and salt if needed (see notes).
In a large skillet over medium high heat, add the olive oil. Sear the shrimp for about 2 minutes per side or until cooked through. The internal temperature should be 145 degrees.
Remove from the pan and set aside on a plate. Turn the heat down to medium and add the butter.
Add the sausage and sauté for 3-4 minutes or until browned.
Add the bell pepper and sauté for 2-3 minutes or until slightly softened.
Add the shallot and garlic. Sauté for 1-2 minutes.
Stir in the remaining cajun seasoning and lemon pepper.
Deglaze the pan with the broth, scraping up any brown bits on the bottom of the pan.
Turn the heat to medium low. Stir in the heavy cream.
Add the cream cheese and stir continuously until mostly melted.
Stir in the parmesan cheese.
Fold in the pasta and finish cooking for about 1 minute in the sauce. Add pasta water if needed to loosen the sauce. It will also add salt. Add more salt and pepper if needed.