Microsoft Senior Software Engineer interview questions

I was initially contacted by recruiter over LinkedIn with generic message on 21st November. I replied on 22nd and sent hime my resume. The recruiter disappeared. When I pinged him again on December 6th, he replied and we had a phone conversation. He told me that he will forward my resume to hiring managers in Azure. He then disappeared again for 2 weeks. When I pinged him again just after christmas, he said he will get back to me again. He again disappeared and finally replied on 10th January that couple of teams in Azure are interested. He asked me send him over time slots for phone screening. I did and then it was radio silence again. In first week of february, recruiter told me to send my new availabilities for phone screenign. I did again. Finally my phone screen was set. The phone screen was held using Skype for business, which does not have client for Ubuntu. So I managed to get hold of a mac for interview. The interviewer also did not know how to use the Skype for business. He asked me some design questions. At the end when I asked interviewer about when I should expect to hear from recruiter, he said "Your guess is as good as mine". When I told him about the long process I have been part of, he promised to expedite the process. And sure enough after 3 days I learned that I have cleared the phone screening. But recruiter called me and told me that I should not have complained about the long time for me to get phone screening and it looks bad for me and I should refrain from mentioning this again in on-site interview. It has been a week, but my onsite has not been scheduled, despite me telling the recruiter that I have other interviews lined up. It doesn't matter, as I am not going on on-site interview anyway.