Don't do a test if asked! They were quick to respond and wanted to see a portfolio. Then they asked to complete a test - designing a whole app. They never responded to the submission and didn't reply to any follow-ups, best not to waste your time dealing with them.

They are frauds and do not carry out any task. The CTO does respond after sending out the task. They act like they don't see the work you did and ghost you. Be warned, they are frauds.