Pollo Saltado Peruvian Style Chicken Stir Fry

Name: Pollo Saltado (Peruvian-Style Chicken Stir-Fry)
Ingredients: 2 large skinless, boneless chicken breast halves, cut into strips; 2 tablespoons soy sauce; 2 tablespoons vinegar; 1 teaspoon paprika; 1 teaspoon ground cumin; ground black pepper to taste; 1 clove garlic, minced; 0.5 (32 ounce) package frozen steak-cut French fries; 0.5 tablespoon vegetable oil; 1 onion, sliced lengthwise; 1 green bell pepper, sliced into strips; 1 aji pepper, minced; 3 Roma tomatoes, sliced lengthwise and seeds removed