First, their HR contacted me telling me about the full stack opportunity and after that they sent me coding task, which was about creating a web application with front-end/back-end, authentication of API as well as unit tests.
My advice to everyone don't fell in their trap and start working on their coding task immediately. First ask for the technical interview and then work on coding task if they ask otherwise you will waste a lot of time.
I spent four full days on their dumb task which was actually about creating a full web application with backend/front end, working authentication functionality and unit tests. Then I sent my solution back to them for review. They did not sent me any acknowledgement of the task, after some days I sent a reminder to them again if someone checked my task and nobody replied to my email again.
After few days recruiter sent me email that team is not happy with task so they are rejecting me. I asked him at least tell me some reason so that I keep that in my mind in future but still no reply.