Exotel Software Engineer Interview Questions and Answers

Basic quantitative, logical reasoning along with few technical questions

Q1. Core subjects on opps, Ds, and resume based
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Q1. Tell me about yourself
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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. Technical questions that includes coding as well
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Q1. Technical and Managerial discussion
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Q1. Salary discussion
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Q1. List tuple python memory management Codig question RestAPIs HTTP methods State Management UI
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Q1. What is VTable and VPtr
Ans. 
VTable is a table of function pointers used in object-oriented programming to implement polymorphism. VPtr is a pointer to the VTable.
• VTable is used to store pointers to virtual functions in a class.

• VPtr points to the VTable of an object to enable dynamic dispatch of virtual functions.

• VTable and VPtr are used in C++ to implement polymorphism and dynamic binding.
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Basic Js concepts like debouncing,event loop, and other output-based questions.

Q1. Js concepts in depth
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Q1. Hiring manager round, questions around my project
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Q2. Optimization techniques
Ans. 
Optimization techniques are methods used to improve the efficiency and performance of software applications.
• Use algorithms like greedy, dynamic programming, or divide and conquer to optimize code

• Minimize time complexity by avoiding nested loops and unnecessary iterations

• Utilize data structures like hash tables, arrays, and trees for efficient storage and retrieval

• Profile code to identify bottlenecks and optimize critic...read more
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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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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
Ans. 
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
Ans. 
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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