Meta E4 onsite | Pass

YOE: 4, equvalent level from another big tech company, passively looking for new job

Coding 1:
Power function
Calculator with only + and *

result:

1. not getting the optimal solution as I started off using recursion and it takes memory, then took a few iteration to make the optimal recursive solution
2. barely completing the second question with stack but I know I can change to O(1) space with minor modification. Same as first question, it took multiple different approaches before the optimal solution.

The interviewer's reactions look positive.

Coding 2:
Balance parenthesis
Next permutation

result:
completed 1 and 2 optimally with minor bugs, but spent some time on debugging the bug

The interviewer's reactions look positive.
Interestingly the interview style is very interactive during the optimization and pretty fun

Product architecture design:
I forgot but it is something related to oculus

result:
I gave out some idea and not sure how it goes as it is my first time doing system design interview, but the interaction seems good.
A bit strange as the interviewer is a new to Meta(like still within training period)

Behavioral:
I think it does not go well because the the interviewer ends early, also the internet disconnected a few time which breaks my answers.

Will wait for feedback but I am expecting to fail

Preparation:
1 leetcode per day for 3 weeks since the phone screen
a lot of system design material

Updates
1 working day after the interview, the hr told me the interviewers are discussing the result and they will come back in 1-2 weeks
2. I passed after a week