Rinse the quinoa under cold water using a fine mesh strainer. In a medium saucepan, combine the quinoa, water, and a pinch of salt. Bring to a boil over medium heat, then reduce heat to low and simmer for about 15 minutes, or until the water is absorbed.
In a large bowl, mix together the cooled quinoa, black beans, chopped red bell pepper, halved grape tomatoes, corn, chopped avocado, and diced red onion. Season the salad with kosher salt and black pepper to your liking.
Pour the cilantro lime vinaigrette over the salad and toss until everything is evenly coated. Adjust the seasoning with more salt and pepper if needed. Serve the salad at room temperature or chilled.