Preheat the grill to medium-high heat. Season the steak with salt and black pepper on both sides.
Grill the beef for 4 to 5 minutes per side for medium-rare, or until it reaches your desired doneness. Remove from the grill and let it rest for 10 minutes before slicing against the grain.
In a small bowl, whisk together the olive oil, red wine vinegar, and fresh herbs to create the vinaigrette.
In a large serving bowl, arrange a base of arugula. Top in sections with the sliced beef, diced avocado, crumbled feta cheese, cherry tomatoes, corn kernels, cucumber slices, and red onion.
Drizzle the herb vinaigrette over the top just before serving and toss lightly to combine.