HackerRank Senior Backend Engineer Interview Questions and Answers

Q1. Question on anagram whether we can form with given strings
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Q2. Play random song from list without repetition
Ans. 
Use Fisher-Yates shuffle algorithm to play songs randomly without repetition.
• Create an array of songs

• Use Fisher-Yates shuffle algorithm to shuffle the array

• Play the first song in the shuffled array

• Remove the first song from the array

• Repeat steps 3-4 until all songs have been played
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Q3. Reverse the linked list
Ans. 
Reverse a linked list
• Iterate through the linked list and change the direction of the pointers

• Keep track of the previous, current, and next nodes

• Set the head of the linked list to the last node after reversing
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Q4. Range sum with the queries
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Q5. Hashing on 2d matrix counting max 1
Ans. 
Hashing algorithm to count maximum number of 1s in a 2D matrix.
• Create a hash table to store the count of 1s in each row.

• Traverse through each row and update the count in the hash table.

• Find the row with the maximum count of 1s in the hash table.

• Return the count of 1s in that row.
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Q6. React interviews hooks
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Coding test was taken on hackerearcth pkatform there was a generic problem statement based on networking no need to pass minimum half of the test cases to clear the interview round

Q1. The next round was one on one round in this questions were mainly asked regarding the experience and then they were mainly focussing on the developers who know rails and python
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Q2. Python and rails were majorly needed to clear the roeund
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Q3. Problem statement can be founded on geeks for geeks
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Normal 3 leetcode medium questions

Machine coding round to design tail -f

Q1. Questions on internal working of os
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Q2. Questions on projects
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Q1. Linux commands,
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Q2. Cloud technologies different services (iaas, paas, saas)
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Cloud technologies offer different services like IaaS, PaaS, and SaaS for varying levels of control and management.
• IaaS (Infrastructure as a Service) provides virtualized computing resources over the internet, such as virtual servers and storage.

• PaaS (Platform as a Service) offers a platform allowing customers to develop, run, and manage applications without dealing with infrastructure.

• SaaS (Software as a Service) deli...read more
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Q3. What do you know AWS
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Discussion about OOPS concepts and String related program

Program on Recursion and Array

Q1. Strength and Weakness
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Q2. Reason for joining with company
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There was coding test

Q1. 2 technical rounds
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Q2. Merge sort algorithm
Ans. 
Merge sort is a divide and conquer algorithm that divides the input array into two halves, sorts them separately, and then merges them back together in sorted order.
• Divide the input array into two halves

• Recursively sort each half

• Merge the sorted halves back together
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Q1. Leetcode Easy question
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It was a Basic Aptitude Test

We were asked to do Sorting, SQL queries (join)

Q1. Can you tell me about yourself?
Ans. 
I am a passionate software engineer with 5 years of experience in developing web applications using various technologies.
• 5 years of experience in software development

• Proficient in developing web applications

• Skilled in using various technologies such as Java, JavaScript, and SQL
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