Mastek Senior Software Engineer and Lead Interview Questions and Answers

Q1. What are closures
Ans. 
Closures are functions that have access to variables from their containing scope even after the scope has closed.
• Closures allow functions to access variables from their outer function even after the outer function has finished executing.

• They are commonly used in event handlers, callbacks, and asynchronous programming.

• Closures help in maintaining state in functional programming.
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Q2. What is virtual DOM
Ans. 
Virtual DOM is a lightweight copy of the actual DOM used for efficient updates in web development.
• Virtual DOM is a concept used in frameworks like React to improve performance by minimizing actual DOM manipulations.

• When changes are made to the virtual DOM, a comparison is done with the actual DOM to determine the minimal updates needed.

• This approach reduces the number of costly DOM operations, resulting in faster rende
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Q3. What are the data types in JS
Ans. 
Data types in JavaScript include number, string, boolean, object, function, undefined, and null.
• Number - represents numeric data, e.g. 10, 3.14

• String - represents textual data, e.g. 'hello', '123'

• Boolean - represents true or false values, e.g. true, false

• Object - represents complex data structures, e.g. { key: 'value' }

• Function - represents executable code, e.g. function() { }

• Undefined - represents a variable that has ...read more
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Q1. Write react code for counter
Ans. 
React code for a simple counter
• Create a functional component for the counter

• Use useState hook to manage the count state

• Render the count value and buttons to increment and decrement the count
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Q1. Salary discussion
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Questions was regarding sql queries mostly

Q1. Basic question regarding sql like aggregate functions , joins
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Q2. Told to write sql query scenario based question
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General aptitude online test

Q1. OOPS basic concepts with eg
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Q2. C#,Sql,MVC concepts
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Q1. Project experience
Ans. 
I have experience working on various projects including web development, mobile app development, and database management.
• Developed a web application using React.js and Node.js for a client in the e-commerce industry

• Created a mobile app using Swift for a healthcare startup to track patient data

• Managed a MySQL database for a financial services company to store and retrieve customer information
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Q2. Coding related questions asked
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Q1. Whats is Denpendency injection?
Ans. 
Dependency injection is a design pattern in which components are given their dependencies rather than creating them internally.
• Allows for easier testing by injecting mock dependencies

• Promotes loose coupling between components

• Improves code reusability and maintainability

• Examples: Constructor injection, Setter injection, Interface injection
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Q2. What is middleware
Ans. 
Middleware is software that acts as a bridge between different applications, allowing them to communicate and share data.
• Middleware facilitates communication between different software applications

• It can handle tasks such as message queuing, data transformation, and security

• Examples of middleware include message brokers like RabbitMQ, ESBs like MuleSoft, and API gateways like Kong
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Since it came through college I was a fresher and it was aptitude + English

Q1. Project questions based on resume
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Q2. Then some HR questions also based
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Q1. What is testing
Ans. 
Testing is the process of evaluating a software application to identify defects or bugs.
• Testing involves executing the software with the intent of finding defects.

• It ensures that the software meets the specified requirements and works as expected.

• Types of testing include functional testing, performance testing, and security testing.

• Examples of testing tools include Selenium, JUnit, and LoadRunner.
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I cant share the details

Q1. Tell me about yourself
Ans. 
I am a dedicated Software Test Engineer with 5 years of experience in manual and automated testing.
• Experienced in creating test plans, test cases, and executing tests

• Proficient in using testing tools such as Selenium and Jira

• Strong problem-solving skills and attention to detail

• Collaborative team player with excellent communication skills
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Q2. Explain frame work
Ans. 
A framework is a set of guidelines, libraries, and tools that help in developing and testing software applications.
• Provides structure and guidelines for developing software

• Includes libraries and tools to simplify development tasks

• Promotes code reusability and maintainability

• Examples: Selenium WebDriver for web automation testing, TestNG for test execution and reporting
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