Fastenal Software Developer Interview Questions and Answers

Q1. Impliment counter using closure in js
Ans. 
Implement a counter using closure in JavaScript.
• Create a function that returns another function which increments a counter variable.

• The counter variable should be defined in the outer function's scope and only accessible to the inner function.

• Each time the inner function is called, increment the counter variable and return its value.
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Q2. Explain promises, promise.all(), impliment binary search
Ans. 
Promises are objects representing the eventual completion or failure of an asynchronous operation. promise.all() is a method that takes an array of promises and returns a single promise that resolves when all of the promises have resolved.
• Promises are used in JavaScript to handle asynchronous operations.

• promise.all() takes an array of promises and returns a single promise that resolves when all promises in the array ha...read more
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Q1. Questions on kafka, cache invalidation, diff b/w authentication and authorization
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Q1. Why you want to join facebook?
Ans. 
I want to join Facebook because of its innovative technology, global impact, and opportunities for growth.
• Innovative technology: Facebook is known for its cutting-edge technology and constant innovation.

• Global impact: Working at Facebook would allow me to contribute to a platform that connects billions of people worldwide.

• Opportunities for growth: Facebook offers a dynamic and fast-paced work environment with ample opp...read more
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Q2. Whats the best feature you like in Facebook?
Ans. 
I appreciate the personalized news feed feature on Facebook.
• Personalized news feed shows content based on user interests

• Helps users stay updated on relevant information

• Allows users to engage with content they are interested in
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They have their own coding platform. The questions are basically from tree.

Tree of space question

Q1. Previous round question solution
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Q2. System design was asked.
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Asked about the dsa questions and about trees

Leecode medium level question

Leetcode Hard level Question

Q1. This is cto round asked some interview questions
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Q1. Just a go thru life and career
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Q2. What are 3 weaknesses
Ans. 
Three weaknesses include lack of experience in a specific technology, difficulty with time management, and tendency to overthink solutions.
• Lack of experience in a specific technology (e.g. not familiar with a certain programming language or framework)

• Difficulty with time management (e.g. struggling to prioritize tasks effectively)

• Tendency to overthink solutions (e.g. spending too much time analyzing a problem before ta
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Q1. Reverse nodes in k-group.
Ans. 
Reverse nodes in k-group is a problem where we need to reverse every k nodes in a linked list.
• Break the linked list into groups of k nodes

• Reverse each group of k nodes

• Connect the reversed groups back together
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Round duration - 75 minutes
Round difficulty - Medium

Test Comprises of 3 coding questions and some MCQs

Round duration - 60 minutes
Round difficulty - Medium

2 coding questions of (1 easy and 1 medium level) on hackerrank code-pair with the Interviewer

Round duration - 60 minutes
Round difficulty - Easy

This Round was based on CS fundamentals and One coding question was there as a Code-pair.

Q1. 
Next Greater Element Problem Statement
Given a list of integers of size N, your task is to determine the Next Greater Element (NGE) for every element. The Next Greater Element for an element X is the firs...read more
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