Start by finely chopping the cilantro, parsley, garlic, and red Fresno chili. Place them into a medium bowl and add lime juice, vinegar, oregano, salt, and pepper. Slowly whisk in olive oil until everything blends into a smooth yet chunky sauce. Taste and adjust seasoning if needed. Set aside while you prepare the shrimp.
Pat the shrimp dry with a paper towel to remove excess moisture. Lightly season with salt and pepper. Heat olive oil in a skillet over medium-high heat until hot. Add shrimp in a single layer and cook for about 2–3 minutes per side, just until they turn pink and opaque. Remove from the heat immediately to keep them juicy and tender.
Transfer the cooked shrimp into a bowl and toss with the chimichurri sauce until evenly coated. Garnish with red chili flakes for extra spice if you like. Serve immediately while warm with rice, inside tacos, or alongside roasted vegetables. This dish is vibrant, fresh, and ready in minutes.