Happiest Minds Technologies Interview Questions, Process, and Tips

Q1. Cloudfront related questions
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Q2. AWS service like Eks ECS
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Q1. DevOps CICD related
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Q2. IAC terraform question
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Q1. Salary negotiation
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Q2. Simple discussion about yourself
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Q1. Introduction, Process knowledge
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Q2. Naukri portal test
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Q1. Long term goal, family background
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Q2. Ctc negotiation
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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
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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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Basic coding along with general aptitude

Q1. What is oops describe with real time example?
Ans. 
OOPs (Object-Oriented Programming) is a programming paradigm based on the concept of objects, which can contain data and code.
• OOPs focuses on creating objects that interact with each other to solve a problem

• Encapsulation: Objects encapsulate data and behavior. Example: Car object with properties like color and methods like start()

• Inheritance: Objects can inherit attributes and methods from other objects. Example: Anima...read more
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Q2. Describe about data structures with real time examples?
Ans. 
Data structures are ways to organize and store data efficiently in a computer.
• Data structures are used to store and organize data in a way that makes it easy to access and manipulate.

• Examples of data structures include arrays, linked lists, stacks, queues, trees, and graphs.

• For example, an array is a data structure that stores a collection of elements in a contiguous block of memory.

• A linked list is a data structure wh...read more
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Q3. What makes you different from other candidates?
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Q1. Why do you choose happiest minds ?
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Q2. Why should we hire you?
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Q1. Data warehousing related questions
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Q2. SQL scenario based questions
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Q3. Project experience
Ans. 
I have experience working on projects involving data pipeline development, ETL processes, and data warehousing.
• Developed ETL processes to extract, transform, and load data from various sources into a data warehouse

• Built data pipelines to automate the flow of data between systems and ensure data quality and consistency

• Optimized database performance and implemented data modeling best practices

• Worked on real-time data pro...read more
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Q4. Python Based questions
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Q5. AWS features and questions
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Q1. Similar to first round but in depth questions relatively
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Q2. Asked about career goals and stuff
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Q1. General work related conversation
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Q2. Salary discussion
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Q1. Basics Js and react
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Q2. Memoization, useEffect vs useLayoutEffect
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Q1. Asked questions on protocols, memory layout, c programming.
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Q2. C programming tricky questions on structures, string, arm architecture, variable types.
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Q1. In depth questions on programming
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Q1. Basic details of experience
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