'Coding has over 700 languages', '67% of programming jobs aren’t in the technology industry', 'Coding is behind almost everything that is powered by electricity'
Amazon interview experience Real time questions & tips from candidates to crack your interview
SDE - 2
Amazon
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4 rounds | 7 Coding problems
Interview preparation journey
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Preparation
Duration: 3 months
Topics: Data Structures and Algorithms, OOPS concepts, cpp, operating systems, dbms
Tip
Tip

Tip 1 : Expect questions related to Amazon Leadership principles in all rounds, so go through those thoroughly before sitting for the interview process.
Tip 2 : In the design rounds, interviewer doesn’t expect the most ideal answer from you and unless your choice of technology is outrageously wrong, he won’t pinpoint that.
Tip 3 : Data Structures questions are a must in all rounds, so try to master them thoroughly

Application process
Where: Campus
Eligibility: No CGPA criteria
Resume Tip
Resume tip

Tip 1 : Make sure you know everything you mention in your resume
Tip 2 : Have some hands on with hackathons and contests ,which brings an added value to your resume

Interview rounds
01
Round
Easy
Online Coding Interview
Duration90 minutes
Interview date2 Oct 2020
Coding problem2

I got a call from an Amazon recruiter regarding the schedule of the test . She sent me the coding test link which I had to complete within a week. we can attempt the online test anytime, when we have time for a period of 90 minutes at a stretch.Once I completed the test, I got a call to schedule the interviews in two weeks.

1. Shopping Options
Easy
0/40
Asked in companies
AmazonBNY MellonMedia.net
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2. Max Submatrix
Moderate
20m average time
75% success
0/80
Asked in companies
FlipkartMeeshoAmazon

Ninja has been given a matrix ‘MAT’ of integers having size ‘N’ x ‘M’ i.e. N rows and M columns. Ninja has to find the maximum sum submatrix in it. In other words, he has ...

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02
Round
Medium
Video Call
Duration60 minutes
Interview date16 Oct 2020
Coding problem2

Virtual interview occured in amazon chime.The interviewer gave his introduction, asked me a bit on the kind of projects I’ve worked on. Then he started with a data structure problem.

1. Clone a binary tree with random pointers.
Moderate
10m average time
90% success
0/80
Asked in companies
SamsungExpedia GroupAmazon

You are given a binary tree. Apart from the left and right child pointers, each node in the given binary tree points to a random node in the given binary tree. You are supposed to ...

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2. Ninja Port
Hard
0/120
Asked in company
Amazon

Ninja is stuck in a city with ‘N’ colonies, and each colony contains...

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03
Round
Easy
Video Call
Duration75 Minutes
Interview date17 Oct 2020
Coding problem1

This was taken by an engineering manager who asked me regarding my projects for around 10-15 mins and then we moved to a system design problem. He asked me to design Slack messenger.
I started by listing the functional and non-functional requirements(on which he questioned me a bit), then I moved to draw the high-level architecture. The components which I drew were the clients, gateway service(LB + authentication, etc), Messaging Service, User Service, Web Socket Manager service, Fan Out service(I added this for the group messages thing, but he didn’t interrogate much on that).

He asked me what would be the schema of my messages table and the scenarios in which the recipient user is online/offline.Also asked about the partitioning key and primary key of the 2-3 tables which I had made

1. Technical Questions

This was taken by an SDE III guy, who again asked me about my projects for like 10 mins and then moved on to a low level design question.He asked me to design the HackerRank platform.
Again I started with listing down the usecases which I would cover, the interviewer asked me to write all the APIs which I would need to expose.

04
Round
Hard
Video Call
Duration60 minutes
Interview date20 Oct 2020
Coding problem2

BarRaiser Round

This was again taken by an engineering manager who discussed my projects in depth for around 20-25 mins. In the remaining time he asked me 2 dsa questions. (Yes I too was surprised that he didn’t ask anything regarding design).

In almost all the rounds, I was asked questions related to Amazon Leadership principles, so do make sure you go through those before sitting for the interview process. You can refer to this link(https://www.codingninjas.com/codestudio/problem-lists/top-amazon-coding-interview-questions) for practicing the same, I found it useful. 
In the design rounds, interviewer doesn’t expect the most ideal answer from you and unless your choice of technology is outrageously wrong, he won’t pinpoint that.

1. Group Anagrams Together
Moderate
0/80
Asked in companies
Paytm (One97 Communications Limited)Dell TechnologiesGoldman Sachs

You have been given an array/list of strings 'STR_LIST'. You are supposed to return the strings as groups of anagrams such that strings belonging to a particular group are anagrams of one an...

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2. Add Linked Lists
Easy
20m average time
80% success
0/40
Asked in companies
Info Edge India (Naukri.com)GoogleAmazon

Given two numbers represented by linked lists. Your task is find the sum list and return the head of the sum list.

The sum list is a linked list representation of addition of two numbers.

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