SELLinALL Interview Questions and Answers

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
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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. 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
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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
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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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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. System design for robust e-commarce site
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Q2. How to reduce the failure rate for payment gateway which is communicating to multiple 3rd party wallets and credit card transactionm
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Implementing strategies to enhance reliability and reduce failure rates in payment gateway integrations.
• Implement retries with exponential backoff for failed transactions to handle temporary issues.

• Use circuit breakers to prevent overwhelming third-party services during outages.

• Monitor and log transaction failures to identify patterns and root causes.

• Implement fallback mechanisms to alternative payment methods when pri...read more
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Q1. Multithreading and Java8 coding question
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Q2. System design question on payments, design patterns and Java, Spring Questions
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