In a large skillet, heat the olive oil on medium-high heat. Add the shrimp and salt. Cook the shrimp for 1 to 2 minutes per side until almost opaque, turning them with tongs.
Just before the shrimp are fully cooked, add the 1/4 cup pesto and continue cooking for 30 seconds, stirring continuously.
Serve immediately. If using store-bought pesto, adjust lemon and or salt accordingly.