Fiserv Software Tester Interview Questions and Answers

Q1. Write a Java Program to reverse a string
Ans. 
Java program to reverse a string
• Create a char array from the input string

• Use two pointers to swap characters at opposite ends

• Continue swapping until the pointers meet in the middle
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Q2. Write a program to find duplicate in given string and print the count of characters
Ans. 
Program to find duplicates in a given string and print the count of characters
• Iterate through each character in the string and store the count of each character in a hashmap

• Print the characters with count greater than 1 to find duplicates

• Handle both uppercase and lowercase characters separately if needed
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Q1. API test cases, API workflow
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Q2. Test cases for mobile recharge
Ans. 
Test cases for mobile recharge feature
• Verify user can successfully recharge their mobile with valid amount

• Verify user receives confirmation message after successful recharge

• Verify user cannot recharge with invalid amount

• Verify user cannot recharge with insufficient balance

• Verify user cannot recharge if network connection is lost
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Q1. Basic core Java, selenium questions
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Q1. Selenium questions and code to solve
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Q1. Api testing, core Java , selenium questions
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Q1. Typically Managerial round, checks for hypothetical scenarios which I have faced with my work experience
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Q1. Explain testing framework used in project
Ans. 
The testing framework used in the project is Selenium with TestNG for automated testing.
• Selenium is used for automating web applications testing

• TestNG is used for organizing test cases and generating reports

• Framework allows for easy maintenance and scalability

• Integration with CI/CD tools like Jenkins for continuous testing
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Round duration - 60 minutes
Round difficulty - Easy

Started with the introduction.
Then there were two-three coding questions.
Some OS and DBMS concepts were asked.
Questions related to testing were also included.

Q1. 
Reverse the String Problem Statement
You are given a string STR which contains alphabets, numbers, and special characters. Your task is to reverse the string.
Example:
Input:
STR = "abcde"
Output:
"e...read more
Ans. Optimal Solution
• Traverse the string and swap the first character with the last character, the second character with the second last character and so on.
• Basically, you need to swap the i-th character with the (N-i-1)-th character where N is the length of the string and 0-based indexing is considered.
Space Complexity: O(1)Explanation:
O(1).
 
In the worst case, only constant extra space is required.
Time Complexity: O(...read more
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Q2. 
Number and Digits Problem Statement
You are provided with a positive integer N. Your task is to identify all numbers such that the sum of the number and its digits equals N.
Example:
Input:
N = 21
Out...read more
Ans. Brute Force
In this approach, we iterate through the numbers from 1 to N. We will find the sum of its digits and add it to the integer itself for each number. Then, we check if the obtained sum is equal to N.
We create a recursive function called sumOfDigits(num) that returns the sum of digits of the number num.
 
Algorithm:
• The function sumOfDigits(num) 
  • If num is equal to 0 return 0
  • Otherwise, return num % 10 + su...read more
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Round duration - 60 minutes
Round difficulty - Medium

This was quite a tough round that can be cleared only by practice and understanding the problem. They asked about the profile first, then questions related to testing, SDLC, and so on. And then, I was asked to write test cases for two to three problems. Writing a test case was a task in this round. The interview was a senior testing engineer and was very friendly and helpful also and answered all my queries related to work.

What ever is there in your resume they would ask.

Q1. Why do you want to join master card
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Only technical question will be ask

Questions from java, c programing, selenium, api

Q1. Basics of selenium Testng Cucumber Core java Some programs Git commands
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Q1. Discussion about your role Salary
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