LinkedIn interview questions

Contacted on LinkedIn by a recruiter. After an initial chat with the recruiter, he offered some teams of interest. Then two phone screens. First phone screen was around Java specific questions and coding for multhreaded datastructure . Second phone screen asked me to create a minimal spanning tree. Easy enough. I got the reply back in 4 days. Then they setup the onsite. I was flown in to Mountain view. They took care of flight, car rental and hotel expenses. The onsite consisted of 5 interviews and a tour at the end. The onsite question were considerably more difficult. Each interview had a shadow interviewer so that made things more stressful. Two interviews were deep dives into projects on my resume. They wanted to know each and every detail including why I made certain decisions, what were the tradeoffs, what were the most difficult bugs, what mistakes I made and more technical details. One interview was on system design where they asked me to implement my own web crawler system. Again very technical and deep. I didn't know much about search systems so didn't do very well here. Two interviews focused on coding. First was a Dynamic programming question that I had not seen before. Required a bit of help to realize that it was a DP. Was able to write code after I realized the approach. Second coding question was to find the longest arithmetic progression in an array of integers. This was easy. Got an offer after one week. The offer was decent. I spoke to some friends of friends working at linkedin and got a sense that it was not a healthy work environment and they weren't very happy. The office space was crowded beyond what it could hold and the environment just didn't seem like a place where I could do my best work.

LinkedIn Recruiter got in touch with me via LinkedIn. Initial phone interview for culture fit, second was phone interview with discussion about my technical background, third was a technical/coding phone interview. Haven't heard back.