Exotel SDE-1 Position Interview Questions and Answers

Q1. SQL Questions - Constraints- how to optimize long SQL query without changing the output
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Sql mcq questions with medium difficulty

Q1. What is inheritance? What are advantages of oops? What's indexing in sql?
Ans. 
Inheritance is a concept in object-oriented programming where a class inherits properties and behaviors from another class.
• Advantages of OOPs include reusability, modularity, and flexibility in code design.

• Indexing in SQL is a way to optimize database queries by creating indexes on columns to improve search performance.
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Q1. What was your previous job role? What methodologies did you follow while working?
Ans. 
I was a Software Developer at XYZ Company. I followed Agile and Scrum methodologies.
• Worked as a Software Developer at XYZ Company

• Followed Agile and Scrum methodologies for project management

• Participated in daily stand-up meetings, sprint planning, and retrospectives
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Q1. What are you leaving your current organization?
Ans. 
Seeking new challenges and opportunities for growth.
• Looking for new challenges and opportunities for professional growth

• Interested in working on different technologies or projects

• Seeking a more collaborative or innovative work environment
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Q1. Reconciliation based question medium
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Q1. It was mostly on scenario based questions and I was asked to code online.
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Q1. Discussion were there past projects, how different objectives were done.
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Q1. Round 1 was hackerrank test. MCQs and coding questions.
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Q2. Kafka related questions.
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Q3. Java 8 related questions. Java streams.
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Q1. Starting from full form of SQL to RDBMS, CTE and some most common window functions, they asked everything. Questions were easy.
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Q1. Concept of Hoisting in Javascript
Ans. 
Hoisting is a JavaScript behavior where variable and function declarations are moved to the top of their containing scope during compilation.
• Variable declarations are hoisted to the top of their scope, but not their initializations.

• Function declarations are fully hoisted, including their definitions.

• Hoisting can lead to unexpected behavior if not understood properly.
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Q2. What is arrow function
Ans. 
Arrow functions are a concise way to write functions in JavaScript.
• Arrow functions are anonymous functions defined using the '=>' syntax.

• They have a shorter syntax compared to traditional function expressions.

• Arrow functions do not have their own 'this' keyword, instead they inherit it from the parent scope.
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Q3. Polyfill of Promise
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Polyfill of Promise is a code that adds Promise functionality to browsers that do not support it natively.
• Polyfill is a piece of code that provides the technology that you expect the browser to provide natively.

• Polyfill for Promise adds Promise functionality to browsers that do not support it, allowing developers to use Promises in their code.

• Examples of Promise polyfills include 'es6-promise' and 'promise-polyfill'.
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Q1. Implementation of carousel
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Implementing a carousel for displaying multiple images or content in a rotating manner.
• Use a library like Slick or Owl Carousel for easy implementation

• Ensure images/content are responsive for different screen sizes

• Add navigation arrows or dots for user interaction

• Consider adding autoplay feature with customizable speed

• Optimize performance by lazy loading images
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FInd 3 numbers in an array whose sum = k.

Q1. Past projects I have worked on
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Q2. Design a Elevator system
Ans. 
Design an Elevator system for efficient vertical transportation
• Consider the number of floors in the building

• Implement a scheduling algorithm to optimize elevator movement

• Include safety features such as emergency stop button

• Allow for both manual and automatic operation

• Consider peak hours and traffic flow in the building
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