20+ Software Quality Engineer Interview Questions and Answers

The problem involves calculating the minimum number of partitions needed to ensure every resulting substring is a palindrome.

• Iterate through the string and check for palindromes at each possible partition point.

• Keep track of the minimum cuts needed to partition the string into palindromic substrings.

• Consider edge cases such as when the string is already a palindrome or when all characters are unique.

• Example: For input 'AACCB', the valid partition 'A | A | CC | B' requires 2 c...read more

Find all leaders in a sequence - elements greater than all elements to their right.

• Iterate from right to left, keep track of maximum element encountered so far

• If current element is greater than maximum, it is a leader

• Return the leaders in the same order as the input sequence

Check if two strings are anagrams of each other by comparing the sorted characters.

• Sort the characters of both strings and compare them.

• Use a dictionary to count the occurrences of characters in each string.

• Ensure both strings have the same length before proceeding.

• Handle edge cases like empty strings or strings with different lengths.

• Example: str1 = 'listen', str2 = 'silent' should return True.

Detect if a singly linked list forms a cycle by checking if a node's next pointer points back to a previous node.

• Traverse the linked list using two pointers, one moving at double the speed of the other.

• If the two pointers meet at any point, there is a cycle in the linked list.

• Use Floyd's Cycle Detection Algorithm for efficient detection.

• Example: Input: 3 2 0 -4 -1, 1 Output: true

Convert a binary tree into its mirror tree by interchanging left and right children of non-leaf nodes.

• Traverse the binary tree in a recursive manner.

• Swap the left and right children of each non-leaf node.

• Continue this process until all nodes are visited.

• Output the inorder traversal of the mirror tree.

Implement a queue using only stack data structures, supporting FIFO principle.

• Use two stacks to simulate a queue: one for enqueueing and one for dequeueing.

• For enQueue operation, push elements onto the enqueue stack.

• For deQueue operation, if dequeue stack is empty, transfer elements from enqueue stack.

• For peek operation, return top element of dequeue stack.

• For isEmpty operation, check if both stacks are empty.

Implement a stack using two queues to store integer values with specified functions.

• Create a stack class with two queue data members.

• Implement push, pop, top, size, and isEmpty functions.

• Ensure proper handling of edge cases like empty stack.

• Use queue operations like enqueue and dequeue to simulate stack behavior.

• Maintain the size of the stack and check for emptiness.

• Example: Push 42, pop to get 42, push 17, top to get 17.

Find the second largest element in an array of integers.

• Iterate through the array to find the largest and second largest elements.

• Handle cases where all elements are identical.

• Return -1 if a second largest element does not exist.

The candidate is asked to solve three coding problems related to integers, subarrays, and word search in a crossword grid.

• For R1: Convert an integer to words, for example, 123 should be converted to 'one hundred twenty three'.

• For R2: Find the subarray with the sum greater than the entire array, for example, in [1, -2, 3, 10, -4, 7, 2, -5], the subarray [3, 10, -4, 7, 2] has a sum greater than the entire array.

• For R3: Find a word in a crossword grid (word search in a boggle), ...read more

If software is not meeting quality standards, I will identify the root cause, work with the team to address the issues, and implement corrective actions.

• Identify the root cause of the quality issues through thorough testing and analysis

• Collaborate with the development team to address the identified issues

• Implement corrective actions such as code refactoring, additional testing, or process improvements

• Monitor the software quality continuously to ensure that the issues are reso...read more

Performing load test using JMeter involves creating test plan, adding thread group, configuring samplers, setting up listeners, and running the test.

• Create a test plan in JMeter.

• Add a thread group to the test plan.

• Configure samplers to simulate user actions.

• Set up listeners to view test results.

• Run the test and analyze the results.

• Adjust the number of threads, ramp-up period, and loop count for load testing.

• Use timers to simulate realistic user behavior.

• Monitor server resourc...read more

Sort a stack using only peek, push and pop operations

• Create a temporary stack to hold the sorted elements

• While the original stack is not empty, pop the top element and compare it with the top element of the temporary stack

• If the top element of the original stack is greater than the top element of the temporary stack, push it onto the temporary stack

• If the top element of the original stack is smaller, keep popping elements from the temporary stack and pushing them back onto th...read more

Function overloading is the ability to have multiple functions with the same name but different parameters.

• Functions with the same name but different parameters can be defined in the same scope.

• The compiler determines which function to call based on the number and types of arguments passed.

• Function overloading is commonly used in object-oriented programming languages like C++ and Java.

Pointers in C are variables that store the memory address of another variable.

• Pointers are declared using the * symbol.

• They can be used to access and manipulate data stored in memory.

• Pointers can be used to pass values by reference.

• Example: int *ptr; ptr = # *ptr = 10; // num now equals 10

• Arrays in C are also implemented using pointers.

TDD is Test Driven Development and BDD is Behavior Driven Development.

• TDD is a software development process where tests are written before the code.

• BDD is a software development process where tests are written in a natural language that describes the behavior of the system.

• TDD focuses on testing the functionality of individual units of code.

• BDD focuses on testing the behavior of the system as a whole.

• TDD is often associated with unit testing, while BDD is often associated wit...read more

To reverse a string without reversing the numbers, split the string into words and reverse each word individually.

• Split the string into an array of words

• Reverse each word individually

• Join the reversed words back together

Software testing is the process of evaluating a software application or system to find defects and ensure it meets the specified requirements.

• Software testing involves executing a program or application with the intent of finding errors.

• It is done to ensure that the software meets the specified requirements and is of high quality.

• Testing can be done manually or using automated tools.

• Types of testing include functional, performance, security, usability, and compatibility testi...read more

Flow diagram of Wafer Test cases

• Start with wafer preparation

• Perform electrical testing on each die

• Check for defects and record results

• Sort dies based on test results

• End with final wafer disposition

Selenium code for writing test case

• Create a new Java class for the test case

• Import Selenium WebDriver and other necessary libraries

• Instantiate a new WebDriver object

• Navigate to the webpage to be tested

• Find the element(s) to interact with using WebDriver methods

• Perform actions on the element(s) using WebDriver methods

• Assert expected results using assertions or if-else statements

• Close the WebDriver object

I chose testing because I enjoy finding bugs and ensuring software quality.

• Enjoy finding bugs and solving problems

• Passionate about ensuring software quality

• Interest in improving user experience

• Opportunity to work closely with developers

A broken links program is a tool used to identify and fix hyperlinks on a website that are no longer working.

• Broken links can negatively impact user experience and SEO rankings.

• The program scans the website for broken links and provides a report of the URLs that need to be fixed.

• Webmasters can use the program to update or remove broken links to ensure a seamless browsing experience for users.

• Examples of broken links include URLs that lead to 404 error pages or have been moved...read more

A framework is a set of guidelines, libraries, and tools used to develop software applications.

• Provides a structure for organizing code

• Offers reusable code and libraries

• Simplifies development process

• Examples: React, Angular, Django

Test cases should cover various scenarios to ensure software quality.

• Test case for positive scenario

• Test case for negative scenario

• Test case for boundary value testing

• Test case for error handling

• Test case for performance testing

A framework is a set of guidelines, libraries, and tools used to develop software applications.

• Framework provides a structure for developers to build upon

• It includes pre-written code and libraries to simplify development

• Frameworks can be specific to a programming language or technology

• Examples: React for front-end web development, Spring for Java applications

Reverse a string by iterating through the characters and swapping them

• Create a function that takes a string as input

• Initialize two pointers, one at the beginning and one at the end of the string

• Swap the characters at the two pointers and move them towards the center until they meet