Paytm Software Testing Engineer Interview Questions and Answers

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.