Coupang Senior Software Engineer Interview Questions and Answers

Algorithm and database and datastructures

Language and basic understanding

Q1. Too much Negotiations
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Q2. Why this much of salary we give you
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Q1. What is react, and why you chose it
Ans. 
React is a JavaScript library for building user interfaces, known for its efficiency and flexibility.
• React allows for the creation of reusable UI components, making development faster and more efficient.

• It uses a virtual DOM for optimal performance by only updating the necessary components when data changes.

• React's component-based architecture promotes code reusability and maintainability.

• It has a large and active comm...read more
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Q1. Print the nodes of a n-ary tree in an arc wise manner as seen from the outside.
Ans. 
Print nodes of n-ary tree in arc wise manner from outside
• Traverse the tree level by level from outside to inside

• Use a queue to keep track of nodes at each level

• Print the nodes at each level in a clockwise or anticlockwise manner
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Simple ds algo and knowledge of nodejs

Q1. Simple question about your previous job
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Q2. Previous salary and previous work exp
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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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Easy to medium-level coding questions on DSA

Q1. DSA question along with basic java needs
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Q2. Create custom linked list
Ans. 
A custom linked list is a data structure where each node contains a value and a reference to the next node.
• Define a Node class with value and next properties

• Define a LinkedList class with head property and methods to add, remove, and traverse nodes

• Example: let list = new LinkedList(); list.add(1); list.add(2); list.remove(1);
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Q1. Of an elevator and some questions on how to implement it with some scenarios
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The coding test was divided in 4 sections:
1> Java and SpringBoot multiple choice questions
The question topics included, multihreading, springboot context, security

2> Leetcode style program question 1 - Easy

3> Leetcode style program question 2 - Medium
Length of longest consecutive ones by at most one swap.

4> Sql query question