Using a vegetable peeler, slice each zucchini into thin flat strips. Place zucchini on paper towel–lined plate to sit while you prep the rest of your ingredients.
In a medium bowl, combine cream cheese, Sriracha, and lime juice.
On a cutting board, lay 2 zucchini slices down horizontally (so that the long side is facing you). Spread a thin layer of cream cheese on top, then top the left side with a pinch each of crab,carrot, avocado, and cucumber.
Starting from the left side, tightly roll up zucchini. Repeat with the remaining zucchini slices and fillings. Sprinkle with sesame seeds before serving.