X Data Science interview questions

I applied in Twitter by forwarding my resume to a HR whom I met in a conference. Since, I live in India and I applied for Twitter, San Francisco, the whole process took close to 2 months. There were total 10 rounds of interviews. The first round was with Product Manager which was more like a exploratory round. He mainly asked domain specific question to see whether I would be a good fit in his team. The next three rounds were conducted in a span of three weeks. The questions were mainly related to Machine Learning, Statistics with focus on experimentation, Algorithms. After 4 rounds, the team decided to conduct remaining interviews on-site, but due to visa issues I had to give remaining 6 interviews online on a single day. The questions were mainly based on Algorithms ( 4 rounds ), Machine Learning and Statistics. Reason for rejection : Coding rounds did not went well.

phone interview with hiring manager, got onsite invitation the same day onsite, meet with 6 engineers. one's data scientist, all others are software engineer. algorithm question mostly, some machine learning question, math/application case. also, one system design question. how large scale machine learning work on distributed system positive feedback, went through hiring committee. However, no offer yet. They're cutting jobs, so bad timing!