Pat the shrimp dry with paper towels to ensure a good sear. In a small bowl, toss the shrimp with chili powder, cumin, sea salt, and black pepper until evenly coated.
Heat the avocado oil in a large skillet over medium-high heat. Once shimmering, add the shrimp in a single layer and sauté for 2-3 minutes per side until pink, opaque, and slightly charred.
While the shrimp cooks, prepare the salad by thinly slicing the cucumber into half-moons and dicing the avocado into small cubes. Finely mince the red onion.
In a small jar or bowl, whisk together the lime juice, extra virgin olive oil, and chopped fresh cilantro to create the dressing.
Combine the cucumber, avocado, and red onion in a large mixing bowl. Drizzle with the lime dressing and toss gently to combine without mashing the avocado.
Plate the refreshing cucumber salad and top with the warm chili-lime shrimp. Serve immediately while the shrimp is hot and the vegetables are crisp.