Microsoft Data Engineer interview questions

Microsoft Prague: There was first series of the interview with HR then they hold for 1 month with the reply. 2d round is technical interview where I was requested to write simple algorithm in python. Then was series consists of 4 interviews: 1 again simple algorithm in python. 2 Interview with the data engineer without specific technical questions on data engineering, though they ask to propose the design of LinkedIn news list specific for each user implementation. That was the only interesting task. 3 is management interview with standard questions - how do you handle stress at work etc. 4. interview with data engineer again basic sql knowledge is enough to pass. Remarkable that during the whole process nor salary nor specific role description is not provided and despite I answered all the questions and mentioned that senior role is the only I can accept. They didn't came up with the offer and didn't explain why. My thoughts is that they couldn't manage to open Senior position for this Job.