XenonStack Data Engineer Interview Questions and Answers

Q1. Find a number in array which is greater than left and right element
Ans. 
Iterate through array and check if element is greater than its adjacent elements
• Iterate through array and check if current element is greater than element at index-1 and index+1

• Return the first element found that satisfies the condition

• Handle edge cases where element is at the beginning or end of array
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Q2. Find the number in the string and return the sum of numbers
Ans. 
Find and sum numbers in a string
• Iterate through each character in the string

• Check if the character is a digit

• If digit, convert to integer and add to sum
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Q1. Basics of Data structures, C++
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Q2. How do you reverse an array
Ans. 
To reverse an array of strings, iterate through half of the array and swap elements from start and end.
• Iterate through half of the array

• Swap elements from start and end of the array
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Q1. Some sql queries and theoritical questions about sql.
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Q2. Everything in your resume will be asked.
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Q1. DSA Structures and Tests
Ans. 
Understanding of data structures and algorithms is crucial for software engineering roles.
• Knowledge of common data structures like arrays, linked lists, trees, graphs, etc.

• Understanding of algorithms like sorting, searching, dynamic programming, etc.

• Ability to analyze time and space complexity of algorithms.

• Experience in writing efficient code using data structures and algorithms.

• Familiarity with common data structure ...read more
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Q2. Question on vertx
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Q1. Need to find output of given code
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Q2. Solve some puzzles
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They asked to remove duplicates from an array in O(n) time and O(1) space

Q1. Questions about Transforrmers
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Q1. No general question, a vague problem was provided without any data for the same. The whole conversation was solving a problem given no information. I was shown a website ans asked to recommend users next ...read more
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Q1. Problem Statement on Javascript Debugging, Core CSS, React Implementation questions
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Q1. Details asked regarding past projects, past experience in detail and in-depth technical questions based on past projects
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Good questions were asked they will check aptitude knowledge

Three questions were there one easy 2 medium

Q1. What's your weaknesses
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Q2. Whats your family background
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