Google Software Developer - Front End interview questions

One Google recruiter contacted me, and we did an quick talk about my background, interest and their requirement. Then the recruiter contacted me to ask reference from anyone who may know me and is working in Google. After a week, I did an phone interview with an engineer. The phone interview is very easy, and it took about 45 minutes to solve a programming challenge and answer some questions. Two weeks after the phone interview, I did an onsite interview. The onsite interview includes 5 rounds with 6 engineers and one lunch with another engineers.

Contacted by recruiters at a few companies. One of which was Google. I discussed what kind of position I was looking to move into and what location I wanted to work from. I later spoke with another recruiter in the location of my choice, again spoke about my interests and set up a phone interview. Phone interview was a blast, I first talked about some projects I worked on (discussing some of the technical details), programmed two problems using Google Docs, then answered a design question relating to scaling an algorithm I wrote all within an hour. I felt like I was collaborating with a coworker, almost as though one would when pair programming. I ended the interview thinking, wow that was actually quite enjoyable. A week after I was invited in for an on-site interview. Due to various obligations I couldn't make it in for the interview for several weeks. When I made it in, I finally met the recruiter. She was very nice. I also saw the insides of the office and knew right then and there this was my kind of work environment. I had five interviews, and a lunch non-interview. Due to my work schedule at the time, I had to travel 7 hours to get to the interview, and slept for about 3.5 hours before. I was a bit tired. Anyways, each interview tested my knowledge of programming. I was able to talk through my approach with the interviewer, and again we discussed some of the trade-offs of my implementations. Three interviews were really fun, four were really thought provoking, and one made me realize that I needed to go out and buy a couple books and do some reading. Everyone I spoke with during my visit was nice and down-to-earth and seemed quite humble despite their sheer intelligence. Although parts were challenging, I just approached it as though it was a regular day at the office and not a big deal. So now that the process is over, I look back and wish it was more challenging. I always like a bigger challenge.