Amazon SDE (Software Development Engineer) Interview Questions, Process, and Tips

Round: Test
Experience: The selection procedure consisted of one online round followed by 4 face to face interviews.
1st round consisted of 20 MCQs of C/C++ and general aptitude. They shortlisted only 11 B.Techs after first round. Then we had 4 separate interviews out of which one was Bar Raiser round (which is most important).

Round: Technical Interview
Experience: Each interview was of around an hour. They mainly emphasized on data structure part. I got a lot of questions from tree and linked list and few were based on Operating System's concepts. For most of the questions, they asked me to come up with more than one approach and also they introduced many variations in between. After the discussion of approach, I was supposed to write the complete code on paper.Each round was kind of elimination round and the Bar Raiser round was most important of all.

General Tips: For improving coding skills, first code basic searching, sorting and graph algorithms.Then try to program few random questions of trees and linked list while studying there concepts. Then practice some questions from sites like codechef or codeforces and also try to participate in the competitions that take place on these sites.For Operating Systems, just go through the book written by "S Galvin" and try to clear concepts of memory management part.
Apart from these main topics, just have a glance at these few topics:
Database : Basic Queries, Indexing, Transaction
OOP : Definition with understanding of four features of OOPs.Among non-technical stuffs, practice some famous puzzles (just Google it).
After all these done, just keep on solving interviews questions being updated regularly at geeksforgeeks
Overall Experience was very good and challenging as it was the very first day of placement and our interviews went till 4 in the morning. So when the result came, we were very excited.
Skills:
College Name: NIT Surathkal

Round: Test
Experience: Out of 20 MCQ's ,I think I solved 13-15 MCQ's Correctly. I solved easy MCQ's first and spent sometime on tough one's.
MCQ's were simple to tough I/O questions ,OS Questions etc.
In coding round they asked one D.P problem and one problem related to stack . I solved the stack question. So I can say
I did OK on this round and got selected to Interview.
Tips: Get comfortable with Data structures and Algorithms, and also have some basic idea of OS,DBMS.
Duration: 1:30 minute
Total Questions: 22

Round: Technical Interview
Experience: The Interviewer was friendly and first he asked questions about my projects, previous internship etc .
He then gave me a question related to B-Tree and asked me to tell the algorithm. First I gave naive solution, then he told me to improve efficiency. Though I took some time, I eventually arrived at a efficient solution. He asked to code that algo in any programming language. so I coded the algo in Java within 10 minutes. He went through my code thoroughly and corrected some minor mistakes. After this he asked if I have any questions for him, I then asked some questions related to work profile. After this round I was called for another techincal round. This round lasted for 50 minutes.
Tips: I prepared from geeks for geeks for interviews and I think it helps a lot. Think out loud as Interviewer also observes your thought process.

Round: Technical Interview
Experience: This round was a breeze as the Interviewer was very warm and he asked me various questions related to the courses
I took. I think he asked questions related to prob theory,OS,discrete Maths etc. I answered most of them correctly.
This round lasted for 45 minutes.
Tips: As said above think out loud and have a good presence of mind. It helps if you revise the courses mentioned in your resume.

General Tips: Practice programming a lot, preferably from Hacker rank etc. Come prepared for the Interview.
Don't panic and have a fresh mind for interview
Skills: Programming, problem solving
Duration: 2 Months
College Name: IIT Madras
Motivation: It's a good company,offering a decent stipend and one more thing it's in Hyderabad which is my hometown.
Funny Moments: Nothing that I remember of.