Soak wakame in cold water 5 minutes. Drain and squeeze out water.
Slice squid into thin rings or strips. Pat completely dry.
Boil salted water. Cook squid 90 seconds exactly. Transfer immediately to ice water 2 minutes. Drain and pat dry.
Slice cucumber, julienne carrot, slice green onions.
Whisk all dressing ingredients in small bowl. Taste and adjust.
Combine squid, vegetables, and wakame in large bowl. Pour dressing over. Toss gently.
Cover and refrigerate minimum 20 minutes before serving.
Top with sesame seeds and chili flakes. Serve cold.