Preheat oven to 400 degrees. With a paring knife, trim tortillas to fit a 9-inch springform pan. Use the bottom of the pan as a guide. Set aside.
Heat oil in a large skillet over medium heat. Add onion, jalapeno, garlic, and cumin; season with salt and pepper. Cook, stirring occasionally, until softened, 5 to 7 minutes.
Add beans and beer, and bring to a boil. Reduce heat to medium; simmer until liquid has almost evaporated, 8 to 10 minutes. Stir in corn and scallions, and remove from heat. Taste and adjust for seasoning.
Fit a trimmed tortilla in bottom of springform pan; layer with 1/4 of the beans and 1/2 cup of cheese. Repeat three times, using 1 cup cheese on top layer. Bake until cheese melts, 20 to 25 minutes. Remove side of pan; sprinkle pie with scallions. To serve, slice into wedges.