CDW Full Stack Developer Interview Questions and Answers

Q1. Project, Oops Concept, Java , which technology u have used ? Framework
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Q2. Framework, Explain Long Polling ,
Ans. 
Long polling is a web technique where the client sends a request to the server and the server holds the connection open until new data is available.
• Long polling is a variation of the traditional polling technique where the client sends a request to the server and the server keeps the connection open until new data is available.

• It is often used in web applications to simulate real-time updates without the need for const...read more
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Q3. GraphQL Vs Rest
Ans. 
GraphQL is a query language for APIs that allows clients to request only the data they need, while REST is an architectural style for designing networked applications.
• GraphQL allows clients to request specific data in a single request, reducing over-fetching and under-fetching of data.

• REST uses multiple endpoints for different resources, leading to multiple requests for related data.

• GraphQL provides a strongly typed sc...read more
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Round duration - 180 Minutes
Round difficulty - Medium

How can you traverse the DOM with JavaScript?

What is the box model?

What are NoSQL databases? What are the different types of NoSQL databases?

Also there was 2 coding questions. 

Q1. 
Maximum Difference Problem Statement
Given an array ARR of N elements, your task is to find the maximum difference between any two elements in ARR.
If the maximum difference is even, print EVEN; if it is...read more
Ans. 
Find the maximum difference between any two elements in an array and determine if it is even or odd.
• Iterate through the array to find the maximum and minimum elements

• Calculate the difference between the maximum and minimum elements

• Check if the difference is even or odd and return the result
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Q2. 
Distinct Strings With Odd and Even Swapping Allowed Problem Statement
You are provided with an array of strings, and your objective is to determine the number of unique strings within it.
A string is deeme...read more
Ans. 
Determine the number of unique strings in an array by applying swapping operations on odd and even indices.
• Iterate through each string in the array and check if it can be transformed into another string by swapping characters at odd and even indices.

• Keep track of unique strings by comparing them with all other strings in the array.

• Return the count of unique strings found in the array.
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Q1. Questions about current projects
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Q2. Questions about AWS
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Numeric ability,
logical reasoning
verbal ability
abstract reasoning

Data structures
algorithms
system design
time and space complexity