Collect all the necessary ingredients.
Heat the olive oil in a heavy skillet over high heat until it starts to shimmer. Arrange the shrimp in a single layer at the bottom of the pan and let them cook for 1 minute without stirring.
Season the shrimp with salt and continue to cook, stirring occasionally, until they start to turn pink, which should take about 1 minute.
Add the garlic and red pepper flakes, then cook and stir for 1 minute.
Stir in the lemon juice, caper brine, one piece of butter, and half of the parsley, cooking until the butter has melted, which will take about 1 minute.
Lower the heat and add the remaining three pieces of butter. Cook and stir until the butter melts, the sauce thickens, and the shrimp turn pink and opaque, about 2 to 3 minutes.
Using a slotted spoon, remove the shrimp and transfer them to a bowl. Continue cooking the butter sauce, adding water one teaspoon at a time if it becomes too thick, for about 2 minutes.
Season with salt to taste, then serve the shrimp drizzled with the pan sauce and garnished with the remaining parsley. Enjoy!