Bring a medium pot of water to a boil and poach the peeled and deveined shrimp for 2-3 minutes until pink and opaque.
Drain the shrimp immediately and plunge them into a bowl of ice water to stop the cooking process and keep them tender.
Once the shrimp are completely chilled, pat them dry and chop into bite-sized pieces, then place them in a large glass mixing bowl.
Whisk together the lime juice, lemon juice, and extra virgin olive oil in a small ramekin before pouring over the shrimp.
Add the diced cucumber, finely diced red onion, seeded and diced tomato, and minced jalapeño to the bowl.
Gently fold in the cubed avocado and chopped cilantro, taking care to keep the avocado pieces intact.
Season the mixture with sea salt and black pepper, stirring lightly to distribute the spices.
Cover the bowl and let it marinate in the refrigerator for at least 30 minutes to allow the citrus to fully infuse the ingredients before serving.