Add the olive oil, juice and zest of 2 limes, chili powder, garlic powder and about 1/2 teaspoon of salt and pepper to a bowl and mix. Taste for seasonings.
Add the shrimp and pineapple to a skewer (about 5-6 shrimp and 4 pineapple pieces per skewer) and then brush the marinade all over the skewers.
Grill on high heat about 1-2 minutes per side, or until the shrimp is cooked and the pineapple has caramelized. Finish with a sprinkle of salt and enjoy!