Clean, peel, and devein the shrimp, then cut them into bite-sized half-inch pieces.
In a glass bowl, submerge the shrimp pieces in the fresh lime juice, ensuring they are fully covered, and refrigerate for 15 to 20 minutes until the shrimp turn opaque.
While the shrimp cures, finely dice the cucumber, red onion, and roma tomato.
Remove the seeds from the jalapeño and mince it finely, along with chopping the fresh cilantro.
Once the shrimp is ready, add the diced cucumber, onion, tomato, jalapeño, and cilantro to the bowl.
Drizzle the mixture with extra virgin olive oil and season with sea salt and black pepper, stirring gently to combine.
Carefully fold in the diced avocado just before serving to ensure it stays intact and creamy.