As a foreword, I'd like to thank the people who I talked to during the process: Technical Sourcer, Principal Technical Recruiter, and one of the software engineers. I did enjoy speaking to all of you and I appreciate the fact that I got the feedback with the interviewer's remarks. This was extremely helpful.
First, I had a call with a "Technical Sourcer". He briefly described the position details, answered my questions, and requested a CV. Then, I had a technical interview with one of the engineers. I went through my experience, asked a couple of questions about the technologies and tasks. The third stage is a take-home task. The fourth is a call with a hiring manager, but I never reached it.
Let me please describe the reason I marked my experience 'negative'. The main reason is the assessment of the take-home task. The take-home quiz contained 9 tasks. The first 7 are theoretical questions with examples. The last two are coding tasks. I enjoyed the quiz very much. It was quite interesting. However, I got 0 marks for 4 theoretical questions out of 7. I was very curious, how could I have a 0/3 mark for a question, especially as I didn't have any difficulties answering it. The quiz header contained general rules for the answers: "Answer with bullet points; Single sentence per bullet point; Max 4 per question". As this was a separate requirement in the header of the document, my thought was that they intentionally don't want to see a candidate dive too deep or something like that. I followed the rules strictly. In addition to that, all the questions had "list" or "name" issues you see, but none of the questions had "describe the ways to mitigate". Thus, my answers were 1-sentence not-more-than 4 per question and did name the issues only, not touching on ways to correct the mistakes.
As a result, the reviewer commented on two of the questions that "explanation here is quite generic and does not propose a solution". This way, I got 0/3 and 0/2. The other two questions I got 0 marks for were codereview samples. There were flaws there so I admitted them and moved on. Strangely, the rest of the questions were marked excellent and no one asked for more details.
At the same time, they mentioned, they liked my coding and they liked one of my answers on the db-related theoretical question. I contacted them trying to reasonably explain myself and my vision of the situation. However, they didn't see any controversies in task requirements and reviewer's comments. The final answer was "We have candidates who have passed this stage and we know the assignment works well". None of my arguments worked.
I do not know the future, however, right now I am not considering to re-apply later. In my opinion, the company is interested in candidates. At the same time, I consider all that happened to me as a some kind of bureaucratic act or lack of flexibility. Or maybe I am not reasonable, it's up to you to decide.