Coursera Senior Data Engineer Interview Questions and Answers

Q1. Difference between var, let, const.
Ans. 
var, let, and const are all used to declare variables in JavaScript, but they have different scoping rules and behaviors.
• var has function scope and can be redeclared and reassigned

• let has block scope and can be reassigned but not redeclared

• const has block scope and cannot be reassigned or redeclared

• Use const for values that won't change, let for values that will, and avoid var
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Q2. Explain CSS box model. Do padding and margin apply to inline elements?
Ans. 
CSS box model defines the layout of elements on a webpage. Padding and margin can apply to block-level elements but not to inline elements.
• CSS box model consists of content, padding, border, and margin around an element.

• Padding adds space inside the border of an element.

• Margin adds space outside the border of an element.

• Padding and margin can apply to block-level elements like <div> but not to inline elements lik
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Q3. Difference between arrow functions and regular ones.
Ans. 
Arrow functions are shorter syntax for writing function expressions.
• Arrow functions do not have their own 'this' keyword.

• Arrow functions cannot be used as constructors.

• Arrow functions do not have the 'arguments' object.

• Arrow functions are more concise and easier to read.

• Regular functions are better for methods and constructors.
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Q4. How does JavaScript asynchronous model work
Ans. 
JavaScript asynchronous model allows non-blocking code execution by using callbacks and promises.
• JavaScript uses an event loop to handle asynchronous operations.

• Callbacks are functions passed as arguments to other functions and executed when the operation is complete.

• Promises are objects that represent the eventual completion or failure of an asynchronous operation.

• Async/await is a newer syntax that allows writing asyn...read more
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Q1. DS and algorithm questions
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Q1. IOS /Skillset questions some tricky questions
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Q1. Personality and Compensation discussion
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Write the program to swipe number

Q1. How much salary do you want and what was you last ctc
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Q2. Tell me about your family
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Q1. Tell me something about your family members?
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Q1. What was your salary expectation?
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Q1. Low Level design on Quiz Portal Application
Ans. 
Designing a low level architecture for a quiz portal application
• Use a microservices architecture for scalability and flexibility

• Implement a database schema to store quiz questions, answers, and user responses

• Utilize caching mechanisms to improve performance

• Design an authentication system to ensure secure access to quizzes

• Include features for creating, editing, and taking quizzes
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Q1. Questions Based on Python
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Q1. Salary Expectations and Joining Process
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Q1. Introduce yourself
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Scenario based case study

Coding round with 3 problem statements

Q1. Questions related to project you have mentioned on resume
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Q2. Questions related to technologies you have mentioned
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Q3. Questions related to the coding test
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Q4. Nothing discussed everything as I know
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Q5. All the best those who are trying their best
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Common Aptitude along with HTML5, CSS

Q1. Mostly questions were on HTML5,CSS and web development related questions.
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