Bring pot of water to rolling boil. Add noodles, let cook for 10-12 minutes until soft.
Bring wok to high heat. Add beef tips and sear outside. Combine 2 tbsp soy sauce, sweet chili, mustard, honey, cayenne pepper, salt, and garlic powder. Stir together, cook for 5 minutes.
Cut broccoli into small sections. Slice celery into 1/2" chunks. Add to wok, cook for 4-5 minutes.
When noodles finish, drain water, and rinse. Stir 1 tbsp soy sauce in with noodles.
When beef has internal temperature of 155°F, remove from heat. Plate beef and veggies on top of noodles.