Bring a pot of water to a boil and blanch the peeled shrimp for 2 minutes until they are pink and opaque.
Immediately transfer the shrimp to an ice bath to stop the cooking process, then drain and chop them into bite-sized pieces.
In a large glass bowl, whisk together the lime juice, lemon juice, olive oil, sea salt, and black pepper to create the marinade.
Add the chopped shrimp to the marinade and refrigerate for 15 minutes to allow the flavors to meld.
While the shrimp marinates, dice the cucumber, tomato, and red onion, and finely mince the jalapeño and cilantro.
Fold the diced vegetables and cilantro into the shrimp mixture until well combined.
Just before serving, gently stir in the diced avocado to maintain its creamy texture and prevent it from mashing.
Serve chilled in a bowl or over a bed of fresh leafy greens for a clean, nutrient-dense meal.