Put frying pan on a medium-high heat. Use a paper towel and pat-off any excess water on the shrimp. Place some oil in. When it's hot, place shrimp pieces in. Season with a few shakes of salt, black pepper and chili flakes (optional). Cook until you get a nice crispy top on both sides. Turn heat off and set aside.
Bring a pot of water up to boil. Cook pasta until soft. Then drain the pasta in a drainer and cool it completely down under cold water (Don't forget this step!). Shake the excess water off the pasta - as much as you can.
Add the spaghetti to a mixing bowl. Add-in half of the soy-sauce marinade and toss the noodles. Then add-in the mixed greens, tomatoes and shrimp. Add-in some more of the sauce and toss everything once more. Garnish with feta cheese or blue cheese. Bon Appetit!