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Amazon SDE Interview Questions and Answers

Updated 13 Jul 2025

57 Interview questions

A SDE was asked
Q. Design a system for finding the costliest element whenever an element is picked from a box.
Ans. 

Design a system using Max Heap to find the costliest element from a box when an element is picked.

  • Implement a Max Heap data structure to store the elements in the box.

  • Whenever an element is picked, the costliest element can be found at the root of the Max Heap.

  • After picking an element, update the Max Heap by removing the root and reorganizing the heap.

  • Ensure the Max Heap property is maintained during insertion and...

A SDE was asked
Q. What is the meaning of memory leakage?
Ans. 

Memory leakage is a situation where a program fails to release memory it no longer needs.

  • Memory leakage can cause a program to slow down or crash due to insufficient memory.

  • It is caused by programming errors such as not freeing allocated memory or losing references to it.

  • Examples include forgetting to close a file or database connection, or not releasing memory allocated for a variable.

  • Memory leakage can be detect...

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A SDE was asked
Q. Explain the approach of LRU cache and implement using object oriented language
Ans. 

LRU cache is a data structure that stores most recently used items and discards least recently used items.

  • LRU stands for Least Recently Used

  • It is implemented using a doubly linked list and a hash map

  • When an item is accessed, it is moved to the front of the list

  • When the cache is full, the least recently used item is removed from the end of the list

  • Example: A web browser cache that stores recently visited web pages

A SDE was asked
Q. What happens when you type amazon.com into a web browser?
Ans. 

Typing amazon.com in the browser's address bar takes you to Amazon's website.

  • The browser sends a request to the DNS server to resolve the domain name 'amazon.com' to an IP address.

  • The browser establishes a TCP connection with the server at the resolved IP address.

  • The browser sends an HTTP request to the server for the homepage of Amazon's website.

  • The server responds with the HTML code for the homepage, which the b...

What people are saying about Amazon

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cigerrateaddict
1d
works at
Ernst & Young
1,300 Jobs Gone. Because AI Can Now Do It Faster.
Glassdoor and Indeed just laid off 1,300 people yes, the same platforms that help people find jobs are now letting go of their own. Why? cz their parent company is going all-in on AI to “streamline” hiring. Most of these layoffs hit R&D, HR, and sustainability teams in the US. Even glassdoor’s CEO is stepping down. The plan now is to merge glassdoor into Indeed and let AI take over a big chunk of the backend work. Their CEO literally said “AI is changing the world, and we need to move faster and fix what’s broken. Today, about one-third of their code is written by AI. Soon, that could be 50%. And they’re not alone Microsoft, Google, Amazon… all are cutting jobs while letting AI do more of the work. Just last week, Intel cut 4,000 jobs, Microsoft let go of 6,000 CrowdStrike laid off 5% of its staff And all of this, even when profits were up. Scary, isn’t it?
Got a question about Amazon?
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A SDE was asked
Q. Describe the transaction process in detail for transferring funds from one account to another. Also, design a schema for it.
Ans. 

The transaction process involves transferring funds from one account to another. A scheme is designed to ensure secure and accurate transfers.

  • Verify the availability of sufficient funds in the sender's account

  • Authenticate the sender's identity and authorization for the transaction

  • Deduct the transfer amount from the sender's account balance

  • Initiate a request to transfer the funds to the recipient's account

  • Validate ...

A SDE was asked
Q. Describe ACID properties in detail
Ans. 

ACID properties ensure reliability and consistency in database transactions.

  • ACID stands for Atomicity, Consistency, Isolation, and Durability.

  • Atomicity ensures that a transaction is treated as a single unit of work, either all or none of its operations are executed.

  • Consistency ensures that a transaction brings the database from one valid state to another.

  • Isolation ensures that concurrent transactions do not interf...

A SDE was asked
Q. How do you find the kth smallest element in a BST?
Ans. 

To find kth-smallest element in BST, perform inorder traversal and return the kth element.

  • Perform inorder traversal of the BST

  • Maintain a counter variable to keep track of the number of nodes visited

  • When the counter reaches k, return the current node's value

  • If k is greater than the number of nodes in the BST, return null or throw an exception

Are these interview questions helpful?
A SDE was asked
Q. Find the second largest element in an array.
Ans. 

Find the second largest element in an array.

  • Sort the array and return the second last element

  • Iterate through the array and keep track of the two largest elements

  • Use a priority queue to find the second largest element

A SDE was asked
Q. Given a sorted array which can have repeated elements, find the occurrence of an element. The most optimal solution is O(logn) using binary search to find the start and end occurrence.
Ans. 

Given a sorted array with repeated elements, find the occurrence of a given element using binary search.

  • Use binary search to find the first occurrence of the element

  • Use binary search to find the last occurrence of the element

  • Calculate the occurrence by subtracting the indices of the last and first occurrences and adding 1

A SDE was asked
Q. Design a data structure and implement an algorithm to print all the files in a directory, including sub-directories. What data structure and algorithm did you use, and why?
Ans. 

Implement a data structure and algorithm to print all files in a directory, including sub-directories.

  • Use an n-ary tree or stack to represent the directory structure

  • Implement a BFS or DFS algorithm to traverse the directory and print files

  • Handle sub-directories recursively

  • Consider using a queue or stack to keep track of directories to visit

Amazon SDE Interview Experiences

45 interviews found

SDE Interview Questions & Answers

user image Anonymous

posted on 12 Jan 2025

Interview experience
5
Excellent
Difficulty level
Moderate
Process Duration
2-4 weeks
Result
Selected Selected

I applied via Referral and was interviewed in Dec 2024. There were 2 interview rounds.

Round 1 - Coding Test 

OA consisted of two DSA questions.

Round 2 - Technical 

(1 Question)

  • Q1. Was asked dsa based questions.

SDE Interview Questions & Answers

user image Vijayalakshmi Chidambaram

posted on 21 Nov 2024

Interview experience
4
Good
Difficulty level
-
Process Duration
-
Result
-
Round 1 - Technical 

(2 Questions)

  • Q1. General behavioral kinda questions on my last project
  • Q2. LLD question where coding in 30 mins

SDE Interview Questions & Answers

user image Anonymous

posted on 9 Dec 2024

Interview experience
5
Excellent
Difficulty level
Moderate
Process Duration
-
Result
Selected Selected

I applied via LinkedIn and was interviewed in Nov 2024. There were 3 interview rounds.

Round 1 - Aptitude Test 

Simple Normal DSA Question

Round 2 - Coding Test 

Focus on DSA and optimization

Round 3 - Coding Test 

Project Discussion and some Date structure questions

Interview Preparation Tips

Interview preparation tips for other job seekers - It was normal simple

SDE Interview Questions & Answers

user image Anonymous

posted on 12 Jan 2025

Interview experience
5
Excellent
Difficulty level
-
Process Duration
-
Result
Selected Selected
Round 1 - Coding Test 

Good DSA Questions
Recursion, Graph and Tree

SDE Interview Questions & Answers

user image Anonymous

posted on 12 Sep 2024

Interview experience
4
Good
Difficulty level
Moderate
Process Duration
-
Result
No response

I applied via Company Website and was interviewed in Aug 2024. There were 2 interview rounds.

Round 1 - Technical 

(2 Questions)

  • Q1. String pattern matching
  • Q2. Behavioral questions
Round 2 - Technical 

(2 Questions)

  • Q1. Behavioral questions
  • Q2. BFS file system

SDE Interview Questions & Answers

user image Anonymous

posted on 31 Dec 2024

Interview experience
5
Excellent
Difficulty level
-
Process Duration
-
Result
-
Round 1 - Assignment 

There are two straightforward data structure and algorithm questions, while the others primarily consist of multiple-choice questions, mostly focusing on nodes and Python.

Round 2 - Coding Test 

In the telephonic round, they primarily assess your problem-solving skills. The interviewer asked me a binary search question, which I was able to solve, but it took me a considerable amount of time to arrive at the solution. This was likely the main reason for my rejection.

SDE Interview Questions & Answers

user image Aryan Verma

posted on 28 Oct 2024

Interview experience
5
Excellent
Difficulty level
Hard
Process Duration
Less than 2 weeks
Result
Selected Selected

I applied via Naukri.com and was interviewed in Sep 2024. There was 1 interview round.

Round 1 - Aptitude Test 

Find the order of excecution in sql

Interview Preparation Tips

Interview preparation tips for other job seekers - nothing as such go with the flow....

SDE Interview Questions & Answers

user image Yatharth Singh

posted on 5 Dec 2024

Interview experience
3
Average
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
Not Selected

I applied via LinkedIn and was interviewed in Nov 2024. There was 1 interview round.

Round 1 - Coding Test 

It was a one hour DS Algo Round based on recursion and DP. I managed to get to the logic for the problem but couldn't execute compltely due to time constraints

SDE Interview Questions & Answers

user image Anonymous

posted on 29 Jun 2024

Interview experience
4
Good
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
Not Selected

I applied via Naukri.com and was interviewed in May 2024. There were 2 interview rounds.

Round 1 - Coding Test 

HACKER RANK TEST WITH MEDIUM LEVEL QUESTIONS

Round 2 - Technical 

(3 Questions)

  • Q1. CREATE A LINKED LIST
  • Ans. 

    A linked list is a data structure consisting of nodes where each node points to the next node in the sequence.

    • Create a Node class with data and next pointer

    • Initialize a head pointer to null

    • Add nodes by updating next pointers

  • Answered by AI
  • Q2. FIND THE LOOP IN LINKED LIST
  • Ans. 

    To find a loop in a linked list, use Floyd's Tortoise and Hare algorithm.

    • Use two pointers, slow and fast, to traverse the linked list.

    • If there is a loop, the two pointers will eventually meet at the same node.

    • To find the start of the loop, reset one pointer to the head and move both pointers at the same pace.

  • Answered by AI
  • Q3. QUESTION BASED ON DYNAMIC PROGRAMMING

Interview Preparation Tips

Topics to prepare for Amazon SDE interview:
  • Data Structures
  • Algorithms
  • Java
Interview preparation tips for other job seekers - PREPARE WELL ON DATA STRUCTURES AND ALGORITHMS

Skills evaluated in this interview

SDE Interview Questions & Answers

user image Anonymous

posted on 24 Aug 2024

Interview experience
5
Excellent
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
Selected Selected

I applied via Company Website and was interviewed in Jul 2024. There were 5 interview rounds.

Round 1 - Coding Test 

SLiding window problem

Round 2 - Coding Test 

Tree problem variation

Round 3 - Coding Test 

DP Problems same questions but with different cases

Round 4 - HR 

(2 Questions)

  • Q1. Experience with last company
  • Ans. 

    I worked at a tech startup where I developed web applications and implemented new features.

    • Led a team of developers to successfully launch a new mobile app

    • Implemented a new payment gateway system to improve user experience

    • Collaborated with product managers to prioritize and deliver features on time

  • Answered by AI
  • Q2. How you handle pressure
  • Ans. 

    I handle pressure by staying organized, prioritizing tasks, and taking breaks when needed.

    • I prioritize tasks based on deadlines and importance

    • I break down large tasks into smaller, manageable steps

    • I communicate with team members or supervisors if feeling overwhelmed

    • I practice mindfulness techniques like deep breathing or meditation to stay calm

  • Answered by AI
Round 5 - Behavioral 

(1 Question)

  • Q1. Behavioural ROund

Amazon Interview FAQs

How many rounds are there in Amazon SDE interview?
Amazon interview process usually has 2-3 rounds. The most common rounds in the Amazon interview process are Coding Test, Technical and Resume Shortlist.
How to prepare for Amazon SDE interview?
Go through your CV in detail and study all the technologies mentioned in your CV. Prepare at least two technologies or languages in depth if you are appearing for a technical interview at Amazon. The most common topics and skills that interviewers at Amazon expect are Clinical SAS Programming, Architectural Design, C++, Computer Science and Analytical Chemistry.
What are the top questions asked in Amazon SDE interview?

Some of the top questions asked at the Amazon SDE interview -

  1. There is a 12 km road and a contractor who is in-charge of repairing it. Contra...read more
  2. There are n nuts and n bolts represented in two different arrays and a function...read more
  3. Basically it was from snakes and ladders game. There is n x n matrix and you ar...read more
How long is the Amazon SDE interview process?

The duration of Amazon SDE interview process can vary, but typically it takes about less than 2 weeks to complete.

Tell us how to improve this page.

Overall Interview Experience Rating

4.5/5

based on 36 interview experiences

Difficulty level

Easy 15%
Moderate 75%
Hard 10%

Duration

Less than 2 weeks 56%
2-4 weeks 28%
4-6 weeks 6%
6-8 weeks 6%
More than 8 weeks 6%
View more

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Amazon SDE Salary
based on 341 salaries
₹22.8 L/yr - ₹42 L/yr
42% more than the average SDE Salary in India
View more details

Amazon SDE Reviews and Ratings

based on 26 reviews

3.5/5

Rating in categories

3.5

Skill development

3.1

Work-life balance

3.9

Salary

2.5

Job security

3.4

Company culture

3.1

Promotions

3.4

Work satisfaction

Explore 26 Reviews and Ratings
SDE

Chennai

0-8 Yrs

Not Disclosed

SDE

Chennai

3-10 Yrs

Not Disclosed

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