First of all, I would like to say big thanks to Leetcode and its community for helping me prep with the interviews. It was the stressful time for me during the interview journey, I spent almost every single spare time to practice and Leetcoding but got rejected 3 times last year, all were big tech company. However, I didn't give up and continue practicing and leetcoding, then all of them were paid off. I got an offer from Facebook finally.

And it's time for me to give back to the community. Here are the details.

Phone Screen 1:

1. LC medium on String - Solved. And the interviewer asked a follow-up, cleared it.
2. LC medium on Math/Bit manipulation.
   Invited for onsite. Later changed to Virtual Onsite

Virtual Onsite:

Round1:

1. LC hard on Array - Solved and the interviewer asked 2 follow-up questions, cleared it all.
2. LC medium on String - Gave the best approach and coded the mani logic but the interviewer said it was enough because we were running out of time.

Round2:
Product Architecture: Questions related to architecture codebases, methods, class. Answered all those questions except for one.

Round 3:

1. LC medium on Tree - Solved
2. LC medium on Interval - Solved

Round 4

1. General behavioral questions
2. LC easy on String

The following day after the virtual onsite interview, recruiter reached out and said the feedback was good but they haven't decided the level yet. The hiring committee would decide the following week. And finally, the gave me the offer on E4, pretty good though.

I hope this helps.

LC: 300

Conclusion:
Do as many Leetcodes as possible, especially on FB tagged questions. All questions I got in the virtual onsite were similar or variant (For example Binary tree on Leetcode would be N-ary tree)