Preheat oven to 350°F. Set rack in the lower-middle position.
Beat cream cheese, granulated sugar, 1 egg, and 0.5 tsp vanilla until creamy.
Spread the cream cheese mixture into the unbaked pie shell in an even layer.
Whisk 3 eggs, brown sugar, corn syrup, melted butter, remaining vanilla, and salt until glossy.
Fold in pecans until evenly coated.
Gently pour pecan filling over the cream cheese layer, spreading evenly.
Bake 50–60 minutes until edges are set and center still jiggles slightly.
Cool on a rack completely, at least 3 hours. Chill 1 hour for cleaner slices.