Crest Data Systems QA Lead Interview Questions and Answers

Worst experience company is not so good

Q1. What is object oriented programming
Ans. 
Object oriented programming is a programming paradigm based on the concept of objects, which can contain data and code.
• OOP focuses on creating objects that interact with each other to solve problems

• Encapsulation, inheritance, and polymorphism are key principles of OOP

• Examples of OOP languages include Java, C++, and Python
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Q2. Questions on data structute
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Q1. Defect leakage is what
Ans. 
Defect leakage refers to defects that escape detection during testing and are found in production.
• Defect leakage occurs when a bug is not identified during the testing phase.

• Example: A critical bug in a banking application is discovered by users after the software is released.

• It can lead to customer dissatisfaction and financial loss.

• Effective testing strategies, like regression testing, can help minimize defect leakag...read more
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Q1. Salary discussion timings join
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Q1. How much expected salary
Ans. 
Negotiable based on experience and responsibilities
• Salary expectations are dependent on the specific role, responsibilities, and industry standards

• Consider factors such as location, company size, and benefits package when determining salary expectations

• Research average salaries for similar positions in the industry to have a realistic expectation
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Round duration - 40 minutes
Round difficulty - Medium

Asked about time complexity of algorithm, puzzles, DBMS, cutting edge technologies etc. What are indexes?

Q1. 
Flip Bits Problem Explanation
Given an array of integers ARR of size N, consisting of 0s and 1s, you need to select a sub-array and flip its bits. Your task is to return the maximum count of 1s that can b...read more
Ans. 
Given an array of 0s and 1s, find the maximum count of 1s by flipping a sub-array at most once.
• Iterate through the array and keep track of the maximum count of 1s obtained by flipping a sub-array.

• Consider flipping a sub-array from index i to j and calculate the count of 1s in the resulting array.

• Return the maximum count of 1s obtained by flipping a sub-array at most once.
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Round duration - 20 minutes
Round difficulty - Medium

Asked 1 standard algorithm

Q1. 
Number of Islands Problem Statement
You are provided with a 2-dimensional matrix having N rows and M columns, containing only 1s (land) and 0s (water). Your goal is to determine the number of islands in t...read more
Ans. 
Count the number of islands in a 2D matrix of 1s and 0s.
• Iterate through the matrix and perform depth-first search (DFS) to find connected 1s.

• Mark visited cells to avoid redundant traversal.

• Increment island count whenever a new island is encountered.
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