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Amazon SDE Interview Questions and Answers

Updated 13 Jul 2025

57 Interview questions

A SDE was asked
Q. Design a valet parking lot with the basic use-case of assigning a ticket to a customer and retrieving the car later. Three sizes are available. Use best fit and nearest distance algorithms.
Ans. 

Design a valet parking lot with ticket assignment and car retrieval using best fit and nearest distance.

  • Create a parking lot with designated spots for each size of car

  • Assign a ticket to the customer upon entry and record the spot number

  • Retrieve the car by searching for the nearest available spot of the appropriate size

  • Use best fit algorithm to minimize empty spots

  • Implement a system for payment upon exit

A SDE was asked
Q. Describe a scenario where you were given updates on repaired road patches and had to determine the longest continuous repaired patch. What was your solution and its time complexity?
Ans. 

The longest continuous patch of a road being repaired by a contractor is determined.

  • Iterate through the updates and keep track of the start and end points of each patch

  • Calculate the length of each patch and update the longest patch if necessary

  • Return the start and end points of the longest patch

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A SDE was asked
Q. Describe your implementation of a Least Recently Used (LRU) Cache, including your initial O(n) solution using a queue and your optimized O(1) solution using a heap and doubly linked list.
Ans. 

Implementing a Least Recently Used (LRU) Cache using a combination of a doubly linked list and a hash map for O(1) access.

  • Use a hash map to store key-value pairs for O(1) access.

  • Maintain a doubly linked list to track the order of usage.

  • When accessing an item, move it to the front of the list.

  • When adding a new item, check if the cache is full; if so, remove the least recently used item from the back of the list.

  • Exa...

A SDE was asked
Q. Write an efficient program to count the number of tree structures that can be made using n number of nodes. Basically T(n)=summation (T(i) * T(n-i-1)).
Ans. 

The program counts the number of tree structures that can be made using n nodes.

  • Use dynamic programming to solve the problem efficiently

  • Break down the problem into subproblems and store their solutions in an array

  • Iterate through the array to calculate the number of tree structures

  • The time complexity of the program is O(n^2)

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?
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A SDE was asked
Q. Given n nuts and n bolts represented in two different arrays and a function is_fit(nut_i, bolt_j) which returns 0 if it's perfectly fit, 1 if it’s a tight fit and -1 if it's a loose fit, arrange them so tha...
Ans. 

Arrange nuts and bolts so that every nut fits perfectly with the bolt in the same position.

  • Sort both arrays in the same order using a comparison function

  • Use a binary search to find the matching bolt for each nut

  • Repeat until all nuts are matched with bolts

A SDE was asked
Q. How can you measure the time between a user typing "Amazon.com" and the page appearing in their browser?
Ans. 

Measure the time from typing a URL to page load using network requests and timestamps.

  • Use browser developer tools to monitor network requests and timestamps.

  • Implement a JavaScript function to capture the time when the URL is entered.

  • Send a dummy request after the page load to measure response time.

  • Utilize performance APIs like 'performance.now()' for precise timing.

  • Log the time taken for DNS resolution, TCP connec...

A SDE was asked
Q. What is the definition of a tree data structure?
Ans. 

A tree is a data structure consisting of nodes connected by edges, with a single root node and no cycles.

  • Nodes represent elements of the tree, and edges represent the relationships between them.

  • Each node can have zero or more child nodes, and each child node can have its own children.

  • Trees are commonly used in computer science for organizing and searching data, such as in binary search trees.

  • Examples of trees incl...

Are these interview questions helpful?
A SDE was asked
Q. What are the differences between a graph and a tree?
Ans. 

Graphs are non-linear data structures with cycles while trees are hierarchical data structures without cycles.

  • Graphs can have cycles while trees cannot

  • Graphs can have multiple root nodes while trees have only one

  • Graphs can have disconnected components while trees are always connected

  • Graphs can have directed or undirected edges while trees have only directed edges

  • Examples of graphs include social networks, road net...

A SDE was asked
Q. When can you say a graph is a tree?
Ans. 

A graph can be called a tree if it is connected and has no cycles.

  • A tree is a type of graph with no cycles.

  • It must be connected, meaning there is a path between any two vertices.

  • It has n-1 edges, where n is the number of vertices.

  • Examples include family trees, file directory structures, and decision trees.

A SDE was asked
Q. Write a program to determine whether a graph is a tree using an adjacency matrix.
Ans. 

Program to determine if a graph is a tree using adjacency matrix

  • A graph is a tree if it is connected and has no cycles

  • Check if the graph is connected by performing a depth-first search or breadth-first search

  • Check if the graph has cycles by performing a depth-first search and tracking visited nodes

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%
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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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