Bring a large pot of water to a boil and add the shrimp. Cook for 1 minute, drain, then immediately plunge the shrimp into the ice water to stop them from cooking further.
Cut the shrimp into ½-inch pieces and transfer to a medium bowl. Stir in the lime juice and tequila. Cover and refrigerate for 30 minutes.
To the shrimp mixture, add the tomato, avocado, jalapeno, cilantro and salt. Stir gently to combine.