Bring a large pot of salted water to a boil and cook the linguine until al dente. Drain and set aside.
In a small bowl, whisk together the sweet chili sauce, soy sauce, oyster sauce, rice vinegar, and sesame oil.
Heat the vegetable oil in a large skillet or wok over medium-high heat.
Add the sliced beef in a single layer and cook for 2–3 minutes until browned. Remove from the pan.
Add the bell peppers and broccoli to the same pan. Stir-fry for 3–4 minutes until slightly tender.
Stir in the garlic and ginger and cook for about 30 seconds until fragrant.
Return the cooked beef to the pan.
Pour in the prepared sauce and stir until everything is evenly coated.
Add the cooked linguine and gently toss until the noodles absorb the sauce and everything is heated through.
Garnish with sliced green onions and sesame seeds before serving.