Microsoft Senior Developer interview questions

I interviewed twice for different positions at Microsoft Israel for the role Senior Software Engineer. The first interview was onsite, I was asked different algorithm questions which I successfully answered. The interview was around 2 hours and 4 questions was asked. I answered all the questions very fast and wrote the code on the whiteboard. I was told that I passed the interview and the recruiter called to schedule the next one. She said she has to check available hours and will call later. The next time she called, I was told that they chose another candidate. The second attempt was also onsite. Instead of algorithm questions, I was asked very low-level type of questions. The question was more related to an Embedded Software Engineer position. Like implement alloc and free. None of the questions required to write any code and the overall experience of the interview was quite chaotic. The interviewer jumped from topic to topic. With only one hint on one question I answered all the questions and was told that I passed the interview. I was told that I have to do a programming assignment at home. They gave me a very short period of time (only 24 hours) for that. I did the assignment on time and sent it. There was no answer from Microsoft for around a week, and after a question about a small update, I got an email says that they chose another candidate. I was expecting they would at least call me and let me know why the assignment was not good enough.

The interview process is very smooth , applied online and got a call from recruiter in 2 days . 1 phone screen and one OTS test and then onsite . OTS has 3 easy and medium level leet code questions , where we also had to comment and provide analysis of the code . 1) square root without inbuilt function 2) merge two unsorted linked list to sorted array 3) find the bug in the code snipped