Adjust Backend Developer interview questions

very bad experience, so far the worst I have ever had, sent my application and they answered me with a email containing instructions for a code challenge that has to be delivered in 3 business days. I did sent, and after sending, never got any feedback, but was contacted thought linkedin messages telling me that they were interested in me but as a frontend (I have some frontend experience) I asked if the position was as a full-stack or just frontend, just frontend he said, and that I am not considered as a backend, what I answer I am not interested on frontend with you, maybe after my code challenge I won’t be considered as frontend either, so I won’t waste my time with you anymore