Bring a pot of water to a boil and poach the shrimp for 2-3 minutes until pink and opaque.
Immediately transfer the shrimp to an ice bath to stop the cooking process, then drain and pat dry.
In a small bowl, whisk together the extra virgin olive oil, lemon juice, minced garlic, sea salt, black pepper, and chopped fresh dill.
In a large mixing bowl, combine the chilled shrimp, diced cucumber, halved cherry tomatoes, and diced red onion.
Pour the lemon-dill dressing over the shrimp mixture and toss gently to coat every ingredient thoroughly.
Arrange the mixed baby greens on a plate or in a bowl as a fresh, crisp base.
Top the greens with the marinated shrimp mixture and finish with the diced avocado before serving.