Data-Core Systems Senior Software Engineer Interview Questions and Answers

Leetcode easy level questions

Q1. Eliminate subsequent repetitions in a string
Ans. 
Remove subsequent repetitions in a string
• Iterate through the string and compare each character with the next one

• If they are the same, remove the repetition by shifting the characters to the left

• Repeat this process until all repetitions are eliminated
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Q1. Behavioral questions asked by Delivery Manager
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Q1. Behavioral round and past experience
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Q1. Design a URL shortener
Ans. 
A URL shortener is a tool that takes a long URL and generates a shorter, more manageable link.
• Generate a unique short code for each long URL

• Store the mapping between short code and long URL in a database

• Redirect users from short URL to original long URL when accessed
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Q2. Write unit test for a sevice class
Ans. 
Unit test for a service class
• Create a test class for the service class

• Mock any dependencies of the service class

• Write test methods to cover different scenarios

• Use assertions to verify the expected outcomes
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Q1. Basic to medium questions related to DotNet Core MVC, SQL Server, etc
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Q1. Completely unprofessional behavior of the interviewer. - No Introduction Direct start asking questions. - Asking too many misleading questions (First ask what you worked on, then ask did you heard about th...read more
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Q1. Go Lang related questions
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Q2. System architecture
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Q1. About the project. and asked what i did in project. how to create schema in pyspark. what is ADE. what are the difficulties i faced in project. what is spark submit command how we write sparksubmit command...read more
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Q2. No of occurrences of letter in a string.
Ans. 
Count occurrences of a letter in a string.
• Iterate through each character in the string and count occurrences of the specified letter.

• Use a hashmap to store the count of each letter.

• Handle both uppercase and lowercase letters to ensure accurate counting.
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Q1. Data structure question asked
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Q1. Importance of Hibernates
Ans. 
Hibernate is an ORM tool in Java used for mapping Java classes to database tables.
• Hibernate simplifies the development of Java applications by providing a framework for mapping an object-oriented domain model to a traditional relational database.

• It eliminates the need for writing complex SQL queries by allowing developers to work with objects instead of tables.

• Hibernate provides caching mechanisms to improve performanc...read more
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Q1. Why you want to join in V-Soft?
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Coding test on java collections

Q1. Sorting a given array
Ans. 
Sorting a given array of strings
• Use a sorting algorithm like quicksort or mergesort

• Consider the length of the strings for comparison

• Use a comparator function to define the sorting order
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Q2. Database queries. Finding second, thrid highest salary
Ans. 
Use SQL query with ORDER BY and LIMIT to find second, third highest salary
• Use ORDER BY salary DESC to sort salaries in descending order

• Use LIMIT 1,1 to get the second highest salary

• Use LIMIT 2,1 to get the third highest salary

• Example: SELECT salary FROM employees ORDER BY salary DESC LIMIT 1,1

• Example: SELECT salary FROM employees ORDER BY salary DESC LIMIT 2,1
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Q1. Why do you want to change jobs
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Q2. Salary negotiations
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