Company : AMAZON
Profile : SDE 2
Applied through : Instahyre (HR reached out)
YOE : 3 years
Currently employed : mid-sized start up

Round 1: Online Assessment

Time frame: Given 1 week to submit.
Time required : 90 min
No. of questions : 2
Platform : Some amazon's platform

Question 1: No. of Islands.
You can find this problem on LC med.

Question 2: Some min heap LC med question. I don't remember the exact question.

followed by some behaviour questions (15 min).

• HR next day responded and given 1 week of time before scheduling next round

Round 2: Telephonic Interview (1 HOUR 5 min)

Started with introduction. Asked some questions on my current project. Jumped on to question after that.

Design a ticket resolution system for a big e-commerce company.

I asked about the expectations upfront as i had a doubt weather it is HLD or LLD.
He was very very friendly. Discussed the flows, ticket creation, assignment to a right team, make sure that the ticket is resolved based on severity.
Asked me for APIs, DB schema and discussed some more questions on how notification service will work and db schema for the same.

HR called the very next day and asked for a full day time. I asked for some more time to get prepared and he had given me 15 days.

Round - 3 : Virtual F2F (1 HOUR)

Hiring Manager.
Started interview with normal introduction. He asked me about my project and asked some questions on why a particular tech over other options.

Asked me 2 LP questions and had asked me follow up questions as well.

Without wasting time, he directly jumped on to system design question.
Asked me to design facebook.
HLD.
Why SQL DB?
How many DB boxes?
How will caching work?
Bottlenecks in the system?
CDN for photos, videos?

Round - 4 : Virtual F2F ( 1 HOUR ) (Shadow)
Interviewer started with introduction. Again very friendly.
Asked me 1 LP question regarding problem faced and how i solved. 2 follow up questions.
He told me that he will be asked 2 questions.

Question 1 : Given a tree, caculate sum of all nodes who's grandfather node has an even number.

											6
										    / \
										  7    8
										 /\    /\
										3 9   5 7
								
			Ans : 3 + 9 + 5 + 7
			

Question 2 : Given a 2-D matrix which contains only 0 & 1, All rows sorted. Return row number which has maximum 1.

0 0 0 1
0 0 1 1
1 1 1 1
0 0 0 0

Ans : 2

Solved 1st Question. Time was very less so only able to tell the approach for the 2nd

Round - 4 : Virtual F2F ( 1 HOUR ) {BAR RAISER} (Shadow)

Very Very Senior guy from amazon.
Started with breif introduction. Asked me about my work. Asked some questions.
Asked me 2 LP questions. Some follow ups on optimizations basis my answers.

Asked me to design YOUTUBE.
Lots n lots of questions on CDN, permanent data stores, DB to be used, how will i make feed, updating the feed, asked me to wrtie Upload API and how it will work, how will it divide a big video file.

2 days later. I called up HR for feedback and he informed that i am rejected.
I hope my experience will help others. PEACE OUT.