Profile:
MS in CS from US university (New Grad)
Got the initial OA round with 2 coding questions and 2 subjective questions to explain approaches used for the coding questions. I completed all test cases and moved ahead in the process.
For virtual onsite round, recruiter asked me to work on algorithms and data structure since it is a SDE I role. He told me to not prepare for the System Design role as they don’t ask System Design for L4 positions. Even though System Design won't be asked, he gave me a hint that code writing style can be evaluated during the interview.
Round 1: Three behavioral questions, it took about 30 mins to complete the behavioral questions.
Design a book retail website and draw the component diagram. (worked on this one for 25 minutes)
Last 5 minutes, Interviewer asked me if I had any questions.
Round 2: Again three behavioral questions and 30 mins to complete those.
Design a grep tool
(I never saw this question being asked in any interview experience i read over leetcode)
It almost took 30 minutes but the interviewer didn’t seem very impressed with my final code. I tried to do my best.
Interviewer asked if I had any questions, even though it was over 1 hour, I asked him a question since I had a one hour break after this interview.
Round 3: For this round,after introduction, the interviewer first asked me a coding question.
Design a LRU cache. (Again technically a design question!)
I was able to solve it with an efficient solution.
After 35 minutes, the interviewer asked me 3 behavioural questions. For the last 5 minutes I asked a few questions to the interviewer.
Round 4: Again, behavioral questions for around 35 minutes.
Finally a coding question,
return if a string is a valid mathematical expression.
For example:
3 + 4 is a valid
+5 is not valid expression
5 +++ 5 is not valid expression
-5 is not a valid expression (since it is a number)
-2 + 4 is a valid expression
I used stack to solve this problem. I was able to pass the test cases he gave but just before 10 minutes of interview end time, he gave me a test case which couldn't be handled in my code.
3 minutes were remaining for this round, I asked a few questions to the interviewer.
Overall, I think the questions were tough for the L4 level interview. I wasn’t expecting these many low level design questions. It is not that I didn’t prepare for the design questions but I focused more on algorithms and data structure since I have a New Grad profile.
#amazon #sde1 #virtual #onsite #reject