AlgoShack Software Engineer Interview Questions and Answers

Q1. Resume based questions
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Q2. Event loop in nodejs
Ans. 
Event loop in Node.js manages asynchronous operations by executing callback functions when certain events occur.
• Event loop is responsible for handling I/O operations, timers, and callbacks in Node.js

• It allows Node.js to perform non-blocking operations efficiently

• Event loop continuously checks the event queue for new events to execute
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Q3. Javascript es6 questions
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Q1. Promises in javascript
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Promises in JavaScript are objects representing the eventual completion or failure of an asynchronous operation.
• Promises are used to handle asynchronous operations in JavaScript.

• They can be in one of three states: pending, fulfilled, or rejected.

• Promises can be chained using .then() to handle success and .catch() to handle errors.
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Coding test was taken on hackerearcth pkatform there was a generic problem statement based on networking no need to pass minimum half of the test cases to clear the interview round

Q1. The next round was one on one round in this questions were mainly asked regarding the experience and then they were mainly focussing on the developers who know rails and python
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Q2. Python and rails were majorly needed to clear the roeund
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Q3. Problem statement can be founded on geeks for geeks
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Implement tail -f command

Q1. Kafka partitions
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Q2. Elasticsearch queries
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Q1. Why Browserstack?
Ans. 
Browserstack is a popular cloud-based cross-browser testing tool used by developers worldwide.
• Provides access to a wide range of browsers and devices for testing

• Allows for parallel testing to save time and increase efficiency

• Integrates with popular testing frameworks like Selenium and Appium

• Offers features like screenshots, video recordings, and debugging tools

• Used by companies like Microsoft, Twitter, and Airbnb for t
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Q2. Any challenge you faced at current company?
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Yes, I faced a challenge in integrating a new third-party API with our existing system.
• Had to understand the documentation of the API thoroughly

• Encountered compatibility issues with our system

• Worked closely with the API provider to troubleshoot and resolve issues
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2 DSA questions Both are from DP

Q1. 2 Questions , 1 is DSA
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Q2. Second question is Puzzle
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Q1. DSA problems on linked list, OOPs in depth programming, design pattens in Java. Some theoretical knowledge on OOPs and design patterns
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Medium to hard questions based on arrays, dp

Q1. Quick sort algorithm
Ans. 
Quick sort is a popular sorting algorithm that uses divide and conquer strategy.
• Divides array into smaller sub-arrays based on a pivot element

• Recursively sorts sub-arrays

• Combines sorted sub-arrays to get final sorted array

• Time complexity: O(n log n) on average, O(n^2) worst case

• Example: [3, 6, 8, 10, 1, 2, 1] -> [1, 1, 2, 3, 6, 8, 10]
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Q2. Modified rotate a matrix
Ans. 
Rotate a matrix by 90 degrees in place
• Transpose the matrix

• Reverse each row of the transposed matrix
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