Upsolver Senior Software Developer interview questions

At first there was an introductory interview and then a technical interview with a homework assignment. The task is nice, ensuring proper design. I did not pass the interview but they did called me to tell me so, and I also received very detailed feedback where I made a mistakes in the task. In addition, UpSolver sending a book about the correct principles of programming and more. They thank me for the time investment. and in general everyone was very nice and I was surprised to receive such detailed feedback and the book. I would definitely love to be interviewed for the role again.