Amazon Software Engineer II Interview Questions and Answers

Q1. Minimum Knight Moves (LC Medium)
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Q2. OS, CN, DB concepts like multithreading, semaphore, tcp vs udp, transaction and ACId properties. Java concepts like stack vs heap(memory), error vs exception. Any 1 Project discussion for 10 mins
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Q1. What is the implementation of Merge Sort in Java?
Ans. 
Merge Sort is a divide and conquer algorithm that divides the input array into two halves, recursively sorts them, and then merges the sorted halves.
• Divide the input array into two halves

• Recursively sort the two halves

• Merge the sorted halves back together
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Q2. What is the implementation of the Quick Sort algorithm in Java?
Ans. 
Quick Sort is a popular sorting algorithm that uses a divide-and-conquer approach to sort elements in an array.
• Choose a pivot element from the array.

• Partition the array into two sub-arrays: elements less than the pivot and elements greater than the pivot.

• Recursively apply the same process to the sub-arrays.

• Combine the sorted sub-arrays to get the final sorted array.
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Java coding questions

Q1. Explain Java oops concepts?
Ans. 
Java oops concepts include inheritance, encapsulation, polymorphism, and abstraction.
• Inheritance allows a class to inherit properties and behavior from another class.

• Encapsulation hides the internal state of an object and restricts access to it.

• Polymorphism allows objects to be treated as instances of their parent class.

• Abstraction hides the implementation details and only shows the necessary features.
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Q2. What is collections?
Ans. 
Collections in programming refer to data structures that allow you to store and manipulate groups of objects.
• Collections provide a way to organize and manage data efficiently

• Examples include lists, sets, maps, queues, and stacks

• Collections can be used to perform operations like adding, removing, and searching for elements
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Q3. Write a code to reverse number?
Ans. 
Code to reverse a number in JavaScript
• Convert the number to a string to easily manipulate each digit

• Use array methods like split, reverse, and join to reverse the number

• Convert the reversed string back to a number before returning
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Q1. Introduction about yourself?
Ans. 
I am a recent graduate with a degree in Computer Science and a passion for coding and problem-solving.
• Graduated with a degree in Computer Science

• Proficient in programming languages like Java, Python, and C++

• Completed internships at tech companies like Google and Microsoft

• Enthusiastic about learning new technologies and working in a team environment
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Q2. Do you know about the company?
Ans. 
The company is a leading software development firm specializing in creating innovative solutions for various industries.
• Company focuses on creating innovative software solutions

• Has a strong presence in various industries

• Known for their expertise in software development
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BFS Implementation of a jug question.

Q1. Few hashmap questions
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Q2. Object Oriented Programming questions
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Q1. STAR based scenario questions
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Q2. Previous work experience and projects
Ans. 
I have 3 years of experience working as a software engineer, with projects including a mobile app for tracking fitness goals and a web application for managing inventory.
• 3 years of experience as a software engineer

• Developed a mobile app for tracking fitness goals

• Created a web application for managing inventory
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Q1. Data structure and algorithm
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Q2. Some tricky logical question
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Q3. Stack and queue
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Q4. Some basic question about system Design
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Hackerrank Coding Test, Leetcode medium questions

HLD test, was asked to design an online coding platform like leetcode

Q1. Most interesting project you have worked on
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Q2. How do you handle conflict at workplace
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It was a medium-level DSA round

This was also a DSA round

This again a DSA round

Q1. Can't disclose the question because of NDA signed but it was a design round
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Q1. This was a project discussion round
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