Paytm (One97 Communications Limited) interview experience Real time questions & tips from candidates to crack your interview
Software Testing Engineer
Paytm (One97 Communications Limited)
4 rounds | 3 Coding
problems
Selected Interview preparation journey
Preparation
Duration: 5 months
Topics: OOPS, Data Structures and Algorithms, Operating System, Low-Level Design, DBMS
Tip 1 : Practice question from every section (Arrays, String, Data Structures)
Tip 2 : Practice question that required you to write test cases for a problem (as they judge you on your practical implementation)
Tip 3 : Practice low level designing questions (it indirectly helps you to write test cases )
Tip 4 : Choose your favorite Data Structure and practice well on it (as this is the most commonly asked question)
Application process
Where: Campus
Eligibility: 6.8 and above CGPA, Active and dead backlogs not allowed
Tip 1 : Have at least three projects in your resume (Include only those which you can explain and demonstrate)
Tip 2 : Include a column of "Position of Responsibility" in addition to your work experience and technicalities (it is impactful as it shows your extra activities apart from your regular curriculum)
Interview rounds
01
Round
Medium
Online Coding Test
Duration70 minutes
Interview date24 Nov 2020
Coding problem0
It was a coding round only consisting of three questions.
Question 1: It was quite an easy question from an array and can be solved in 5 -7 minutes
Question 2: It was a question related to a binary tree
Question 2: It was again a question of Data Structure
The question seems tough if you don't have proper knowledge or practice of Data Structure.
02
Round
Easy
Face to Face
Duration60 minutes
Interview date28 Nov 2020
Coding problem0
The interview started with the introduction of both. After that, he asked about the OOPS concept - inheritance, polymorphism, abstraction, and so on. Then, he moved onto coding questions that were easy ones but you have to optimize the code in terms of time complexity. Questions were related to String, Array, HashMap. After then, he asked about the concept of DBMS and a brief discussion of some of the concepts like primary key, Foreign key, and join -left, right, full, and so on.
03
Round
Easy
Face to Face
Duration60 minutes
Interview date28 Nov 2020
Coding problem2
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.
1. Reverse the String
Easy
15m average time
85% success
0/40
Asked in companies
You are given a string 'STR'. The string contains [a-z] [A-Z] [0-9] [special characters]. You have to find the reverse of the string.
For example:
If the given string is: STR = "abcde". You have to print the string "edcba".
follow up:
Try to solve the problem in O(1) space complexity.
2. Number And Digits
Easy
15m average time
80% success
0/40
Asked in companies
You are given a positive number ‘N.’ You need to find all the numbers such that the sum of digits of those numbers to the number itself is equal to ‘N.’
For example:
You are given ‘N’ as 21, the only number whose sum of digits and the number itself equals 21 is 15 as 15 + 1 + 5 = 21. Hence the answer is [15].
04
Round
Medium
Face to Face
Duration60 minutes
Interview date28 Nov 2020
Coding problem1
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.
1. Technical Questions
Test Cases for Paytm Wallet (at least 10)
You are downloading a file in your system, write test cases for this situation (5-6 TEST CASES)
Here's your problem of the day 
Solving this problem will increase your chance to get selected in this company
What does ROLLBACK do in DBMS?
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