ZMQ Development Software Test Engineer Intern Interview Questions and Answers

Q1. 2 sum in array
Ans. 
The Two Sum problem involves finding two numbers in an array that add up to a given target value.
• Iterate through the array and store the difference between the target and current element in a hashmap

• Check if the current element exists in the hashmap, if yes return the indices

• Time complexity can be reduced to O(n) using a hashmap
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Q2. Reverse a linked list
Ans. 
Reverse a singly linked list and return the reversed list.
• Iterate through the linked list and reverse the pointers to point to the previous node instead of the next node.

• Use three pointers to keep track of the current, previous, and next nodes while reversing the list.

• Update the head of the list to be the last node after reversing.
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Q3. In given time slots , find conflicting time slots
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Q1. Asked about projects
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Q2. Longest palindrome
Ans. 
Find the longest palindromic substring in a given string.
• Iterate through each character in the string and expand around it to find palindromes

• Use dynamic programming to optimize the solution

• Consider both odd and even length palindromes
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Had 50 qsns in 45 min

Had 5 qsns to execute topics like tress and graphs

Q1. Sql queries and how to extract the data
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Q2. Oops concepts and their execution
Ans. 
Oops concepts are fundamental principles of object-oriented programming that help in organizing and designing code efficiently.
• Encapsulation: Bundling data and methods that operate on the data into a single unit (class).

• Inheritance: Allowing a class to inherit properties and behavior from another class.

• Polymorphism: Ability of objects to take on multiple forms or have multiple behaviors.

• Abstraction: Hiding the complex ...read more
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Online coding test had two questions to be solved in 60 mins. Medium level questions to be expected.

Q1. Codility test: Moderate level machine coding round, not leetcode type. Deep understanding of interface and backend knowledge required. Interviewer was absolutely uninterested.
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Q1. Spark architecture.
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Q2. Narrow and wide transformations
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Q1. Strecture of sql statement
Ans. 
SQL statements are used to interact with databases by performing operations like querying, updating, and deleting data.
• SQL statements are made up of keywords like SELECT, INSERT, UPDATE, DELETE, etc.

• They are structured in a specific order, with clauses like WHERE, ORDER BY, GROUP BY, etc.

• Tables are referenced using their names, and conditions are specified to filter data.

• Joins can be used to combine data from multiple
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Good level question. I have qualified for the next round

Basic to intermediate question, Cleared the test

Q1. Tell me about yourself and introduce yourself
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Q1. Automation testing with testing tools
Ans. 
Automation testing with testing tools involves using software to execute tests and compare actual results with expected results.
• Automation testing saves time and effort compared to manual testing

• Testing tools like Selenium, Appium, and TestComplete are commonly used for automation testing

• Automation testing can be used for regression testing, load testing, and performance testing

• Automation testing requires programming s...read more
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Q2. Integration with automation Devops process
Ans. 
Integration with automation DevOps process is crucial for efficient software testing.
• Automation testing tools can be integrated with DevOps tools like Jenkins, Git, and Docker.

• Continuous integration and continuous delivery (CI/CD) pipelines can be set up for automated testing.

• Test cases can be triggered automatically with each code commit or deployment.

• Test results can be reported back to the development team for quick...read more
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