Bring a large pot of salted water to a boil, add the peeled and deveined shrimp, and poach for 2 to 3 minutes until they are pink and opaque.
Immediately drain the shrimp and transfer them to 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, extra virgin olive oil, chili powder, sea salt, and black pepper in a small jar.
Pour the dressing over the shrimp and add the diced cucumber, red onion, tomato, and cilantro, tossing gently to combine.
Cover the bowl and let the mixture marinate in the refrigerator for at least 15 minutes to allow the flavors to meld.
While the ceviche marinates, slice the corn tortilla into small triangles and bake at 375°F for 8-10 minutes until crisp and golden.
Just before serving, gently fold in the diced avocado and serve the ceviche chilled alongside the homemade tortilla chips.