Paytm Softwaretest Engineer Interview Questions and Answers

Q1. Functional Testing all concepts
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Basic Oops MCQ and aptitude and one da

Q1. Basic dsa and project
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Q1. DSA and project related
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Q1. One leetcode easy-medium problem
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Q2. Java, springboot and oops question
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Q1. Project related questions
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Q2. System design questions
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You should be familiar with core java features. Collections, converting one collection Array / Vector to other. Removing duplicates. Lambda chaining / Functional programming. Basic SQL - Joins, Aggregates etc.

Q1. Explain Architecture of applications you worked on. Justify use of components. System Design questions.
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Q1. Same as posted in advice
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2 questions. 1 was basic level. 2 was of medium level.

Q1. An ambiguous problem statement was given. Asking relevant questions revealed the problem to be largest island in a binary matrix. Was asked to code on an ide. And reduce space complexity to O(1).
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Q2. Maximum sum path from root to leaf in an N-ary tree. Was asked to design an appropriate data structure. Then code the solution in O(n) time and O(1) space.
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Q1. Through discuss of projects. Methods used.
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Q2. First missing positive number in an array of integer in O(n) time O(1) space.
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Find first missing positive number in an array in O(n) time and O(1) space.
• Traverse the array and mark the presence of each positive integer by changing the sign of the corresponding index.

• Traverse the array again and return the index of the first positive integer.

• If all integers are present, return the length of the array + 1.

• Example: [3, 4, -1, 1] => mark 3rd and 4th index as negative => return 2.

• Example: [1, 2, 0] =...read more
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Q3. Given an integer, print the relevant column name in an excel sheet. Ex: 1- A , 2-B.......... 26-Z , 27-AA, 28-AB........ Was asked code on an ide and test cases were given.
Ans. 
Given an integer, print the relevant column name in an excel sheet.
• Create a string array of alphabets from A to Z

• Use modulo operator to get remainder and divide by 26 to get quotient

• Append the corresponding alphabet to the result string

• Reverse the result string
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Q1. What are your salary expectations?
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Q1. What is dependency injection and inversion principle
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Dependency injection is a design pattern that allows objects to receive dependencies rather than creating them internally.
• Dependency injection is a way to achieve loose coupling between objects.

• It allows for easier testing and maintenance of code.

• Inversion principle states that high-level modules should not depend on low-level modules, but both should depend on abstractions.

• This principle helps to achieve a more flexib...read more
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Q2. Program to find missing number in array
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Program to find missing number in array
• Iterate through the array and calculate the sum of all elements

• Calculate the sum of all numbers from 1 to n (where n is the length of the array)

• Subtract the sum of array elements from the sum of all numbers to get the missing number
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