Gamix Labs QA Engineer Interview Questions and Answers

There were two coding questions; one was related to linked lists, and the other was linked to binary trees.

Q1. Can you elaborate on the project discussion you mentioned in your resume?
Ans. 
Developed a web application for tracking inventory and sales data
• Used React for front-end development

• Implemented RESTful APIs using Node.js and Express for back-end

• Utilized MongoDB for database management

• Integrated authentication and authorization features for secure access

• Implemented data visualization using Chart.js
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Q2. Can you provide the code to reverse a linked list?
Ans. 
Reversing a linked list involves changing the direction of pointers to go from the end to the beginning.
• Start by initializing three pointers: current, previous, and next.

• Iterate through the linked list, updating the pointers to reverse the direction of the links.

• Update the head of the linked list to point to the new first node, which was the original last node.
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Q3. Some questions were asked regarding the four pillars of Object-Oriented Programming (OOP)?
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Q4. Questions related to pointers, dangling pointers.
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Q1. Program for finding the perfect squares between two numbers.
Ans. 
Program to find perfect squares between two numbers
• Iterate through numbers between the given range

• Check if the square root of the number is an integer

• If yes, then it is a perfect square
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Q2. What are smart pointers in C++?
Ans. 
Smart pointers in C++ are objects that act like pointers but provide automatic memory management.
• Smart pointers help prevent memory leaks by automatically managing memory allocation and deallocation.

• Examples include unique_ptr, shared_ptr, and weak_ptr.

• unique_ptr is used for exclusive ownership, shared_ptr for shared ownership, and weak_ptr to prevent circular references.
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Q3. What is mutual exclusion in the context of concurrent programming?
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Mutual exclusion is a concept in concurrent programming where only one thread can access a shared resource at a time.
• Ensures that only one thread can access a critical section of code at a time

• Prevents race conditions and data corruption

• Commonly implemented using locks, semaphores, or mutexes

• Example: Using a mutex to protect a shared variable in a multi-threaded application
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Q4. What is the process for implementing multithreading?
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Implementing multithreading involves creating and managing multiple threads to execute tasks concurrently.
• Identify the tasks that can be executed concurrently

• Create and manage multiple threads to execute these tasks simultaneously

• Use synchronization techniques like locks and semaphores to prevent race conditions

• Handle communication and coordination between threads

• Consider thread safety and resource sharing issues
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Basic aptitude test, if you know basic maths you can easily crack it.

Sort the array and eliminate duplicates.

Q1. What are the distribution and sort keys in Amazon Redshift, and how do they impact data organization and query performance?
Ans. 
Distribution and sort keys in Amazon Redshift impact data organization and query performance.
• Distribution key determines how data is distributed across nodes for parallel processing

• Sort key determines how data is physically stored on disk to optimize query performance

• Choosing appropriate distribution and sort keys can significantly improve query performance

• Example: Distributing data based on a column with high cardinal
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Q2. Questions with choosing different set of distribution keys for different cases
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Q1. Behavioral questions
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Basic coding test like palindrome, series,arrays

Q1. Logical questions,puzzle, behavioural round, introduction
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Q1. Search in 2d matrix
Ans. 
Search for a target value in a 2D matrix efficiently.
• Use binary search on rows to find the potential row where the target value may exist.

• Then use binary search on that row to find the target value.
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Q2. Find quadraplets that sum to target
Ans. 
Find quadraplets in an array that sum up to a target value.
• Use a nested loop to iterate through all possible combinations of quadraplets.

• Keep track of the sum of each quadraplet and compare it to the target value.

• Return the quadraplets that match the target sum.
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Easy coding questions

Tough level questions , needed high level of thinking

Q1. Tell about yourself
Ans. 
I am a dedicated Test Engineer with a strong background in software testing and quality assurance.
• Experienced in creating test plans and test cases

• Proficient in automated testing tools such as Selenium

• Skilled in identifying and documenting software defects

• Strong analytical and problem-solving skills

• Excellent communication and teamwork abilities
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Q2. Why should we hire you
Ans. 
I have a strong background in testing methodologies and a proven track record of delivering high-quality results.
• I have extensive experience in manual and automated testing

• I am detail-oriented and have a keen eye for identifying bugs and issues

• I have excellent communication skills, which helps in collaborating with cross-functional teams

• I am proactive in suggesting improvements to the testing process, leading to more e
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