VELOTIO Technologies Software Engineer Interview Questions and Answers

Q1. What's does the useCallback and usememo in react ?
Ans. 
useCallback and useMemo are hooks in React used for performance optimization.
• useCallback is used to memoize a function and prevent unnecessary re-renders.

• useMemo is used to memoize a value and prevent unnecessary re-computations.

• Both hooks are used to optimize performance by reducing unnecessary re-renders and re-computations.

• useCallback is useful when passing down functions to child components.

• useMemo is useful when c...read more
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Q2. What's difference between async await and promise ?
Ans. 
Async/await is a syntactic sugar over Promises in JavaScript.
• Async/await makes asynchronous code look and behave like synchronous code.

• Promises are objects that represent the eventual completion or failure of an asynchronous operation.

• Async/await is easier to read and write than Promises.

• Async/await can only be used in functions that are marked as async.

• Promises can be used anywhere in the code.
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String manipulation and other aptitude questions

Q1. System Design round
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Q1. Questions on current projects. How & why were the frameworks used
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Q2. Asked basic questions on OS, networking, database
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Q3. Gave take home assignment of DSA questions. One question was to design LRU cache. Don't remember the other one,
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Q1. Difference between concurrency and parallelism
Ans. 
Concurrency is about dealing with multiple tasks at the same time, while parallelism is about executing multiple tasks simultaneously.
• Concurrency is about managing multiple tasks and switching between them quickly.

• Parallelism is about actually executing multiple tasks at the same time.

• Concurrency can be achieved in a single-core processor through task switching.

• Parallelism requires multiple cores or processors to execu...read more
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Q2. How will you sort 1TB of array/data
Ans. 
Use external sorting techniques like merge sort or quick sort to efficiently sort large amounts of data.
• Divide the 1TB array into smaller chunks that can fit into memory

• Sort each chunk individually using a fast sorting algorithm like merge sort or quick sort

• Merge the sorted chunks back together to get the final sorted array

• Consider using parallel processing or distributed systems for faster sorting

• Example: Divide the 1...read more
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Q1. Why are you looking for a change?
Ans. 
I'm seeking new challenges and opportunities for growth that align with my career goals and aspirations.
• Desire for professional growth: I'm looking for a role that offers more opportunities for advancement, such as leadership positions.

• Interest in new technologies: I want to work with cutting-edge technologies that I haven't had the chance to explore in my current role.

• Cultural fit: I'm seeking a company culture that v...read more
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Q2. Share details of your previous job.
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Q3. What are your salary expectations?
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Q1. 2 Sum Problem (leetcode easy) Binary search question give a sorted array return the index we can place the given element in the array. Core Javascript question (refer Akshay Saini series) Core React Questi...read more
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Q1. Array Subsets A Object is given , flat it with the prefix it's key. Reduce polyfill Compose and pipe Normal Js function(event loop, promise, let const var, prototype) Noraml React question.
Ans. 
The interview question covers topics like array subsets, reduce polyfill, compose and pipe, normal JS functions, and normal React questions.
• For array subsets, use the Array.prototype.filter() method to filter out the elements that don't meet the subset criteria.

• Reduce polyfill can be implemented using a for loop or recursion to iterate over the array and accumulate the result.

• Compose and pipe are higher-order functions...read more
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