JUSPAY Front end Developer Interview Questions and Answers

It was on hackerrank, it was given to solve 3 questions in JS along with quiz on js concepts

It was a js fundamental round, was asked similar JS problems asked in the hackerrank test

Q1. Describe your favourite/last project
Ans. 
Developed a responsive e-commerce website for a local boutique selling handmade jewelry
• Used HTML, CSS, and JavaScript to create a visually appealing and user-friendly interface

• Implemented a product carousel to showcase different jewelry collections

• Integrated a payment gateway for secure online transactions
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Q2. How to keep your updated in tech
Ans. 
Stay updated by regularly reading tech blogs, attending conferences, taking online courses, and networking with other professionals.
• Read tech blogs regularly (e.g. TechCrunch, Mashable)

• Attend tech conferences and workshops

• Take online courses and tutorials (e.g. Udemy, Coursera)

• Network with other professionals in the field (e.g. LinkedIn, Meetup)
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Q3. Do you try every new framework comes in the market
Ans. 
I do not try every new framework that comes in the market, but I do stay updated on the latest trends and evaluate them based on project requirements.
• I prioritize learning frameworks that align with the project needs

• I assess the pros and cons of new frameworks before deciding to use them

• I stay updated on industry trends and experiment with new frameworks in personal projects
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Q4. How will you optimise a code
Ans. 
Optimizing code involves identifying and fixing bottlenecks to improve performance and efficiency.
• Identify and remove unnecessary code or functions

• Use efficient algorithms and data structures

• Minimize network requests and optimize asset loading

• Implement caching mechanisms

• Profile and analyze code performance
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Was asked to create a UI component keeping in mind scalability and reuseability.

General discussion about resume and projects, and then some basic JS coding questions like implement throttling and memoization.

Q1. Discussion about past experiences and projects
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Q2. Why you want to leave current job.
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Q3. Expectations from the role and company
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Round duration - 90 Minutes
Round difficulty - Easy

1 coding question which was quite easy. Some MCQ that includes basic questions related to html, css, javascript, oops, dbms and output.

Q1. 
LRU Cache Design Question
Design a data structure for a Least Recently Used (LRU) cache that supports the following operations:
1. get(key) - Return the value of the key if it exists in the cache; otherw...read more
Ans. 
Design a Least Recently Used (LRU) cache data structure that supports get and put operations with a given capacity.
• Implement a doubly linked list to keep track of the order of keys based on their recent usage.

• Use a hashmap to store key-value pairs for quick access and updates.

• When capacity is reached, evict the least recently used item before inserting a new one.

• Update the order of keys in the linked list whenever a ke
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Round duration - 90 Minutes
Round difficulty - Easy

easy round. Had some frontend questions related to html ,css, js , etc Explain Closures in JavaScript. In how many ways can we specify the CSS styles for the HTML element?

Q1. 
String Palindrome Verification
Given a string, your task is to determine if it is a palindrome considering only alphanumeric characters.
Input:
The input is a single string without any leading or trailing...read more
Ans. 
Check if a given string is a palindrome considering only alphanumeric characters.
• Remove non-alphanumeric characters from the input string.

• Compare the string with its reverse to check for palindrome.

• Handle edge cases like empty string or single character input.

• Use two pointers approach for efficient comparison.
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Q2. DBMS Questions
normalization, indexing
Ans. 
Normalization is the process of organizing data in a database to reduce redundancy and improve data integrity. Indexing is a technique to quickly retrieve data from a database.
• Normalization helps in reducing data redundancy by breaking down tables into smaller, related tables.

• Indexing is used to quickly retrieve data by creating indexes on columns in a table.

• Normalization ensures data integrity by minimizing data dupli...read more
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Round duration - 120 Minutes
Round difficulty - Hard

late at 8.00 pm

Q1. 
Priority CPU Scheduling Problem
Given 'N' processes with their “burst times”, where the “arrival time” for all processes is ‘0’, and the ‘priority’ of each process, your task is to compute the “waiting ti...read more
Ans. 
Implement Priority CPU Scheduling algorithm to compute waiting time and turn-around time for processes.
• Implement a function that takes in burst times, priorities, and number of processes as input

• Sort the processes based on priority, with lower process ID as tiebreaker

• Calculate waiting time and turn-around time for each process based on the scheduling algorithm
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Q2. Can you explain the concept of data spooling in operating systems?
Ans. 
Data spooling is a process where data is temporarily stored in a buffer before being sent to an output device.
• Data spooling helps in managing the flow of data between different devices by storing it temporarily.

• It allows for efficient processing of data by decoupling the input/output operations.

• Examples of data spooling include print spooling, where print jobs are stored in a queue before being sent to the printer.
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Q3. What is the difference between inheritance and generalization in the context of database management systems?
Ans. 
Inheritance is a relationship between a superclass and subclass, while generalization is a relationship between entities with common characteristics.
• Inheritance involves a parent-child relationship where the child class inherits attributes and methods from the parent class.

• Generalization involves grouping entities with common attributes into a higher-level entity.

• Inheritance is a specific form of generalization in obje...read more
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Round duration - 45 minutes
Round difficulty - Medium

I applied thorough LinkedIn and got a call from HR for the interview.
I went to their Noida Office.
First round was mainly focused on Javascript fundamentals.
Interviewer was also friendly.

Round duration - 1 hour
Round difficulty - Medium

Second round was after 15 minutes of the first round. The focus of this round was DS & Algorithms.

Q1. 
Find Subarray with Given Sum
Given an array ARR of N integers and an integer S, determine if there exists a subarray (of positive length) within the given array such that the sum of its elements equals S....read more
Ans. 
Given an array and a target sum, find a subarray that sums up to the target sum.
• Iterate through the array while keeping track of the running sum and the starting index of the subarray.

• Use a hashmap to store the running sum and its corresponding index.

• If the running sum - target sum is found in the hashmap, it means a subarray with the target sum exists.

• Return the starting and ending indices of the subarray or [-1, -1]
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Q2. 
Minimum Number of Platforms Required
You are provided with two arrays, AT and DT, representing the arrival and departure times of all trains arriving at a railway station.
Your task is to determine the m...read more
Ans. 
This question asks to find the minimum number of platforms required at a railway station so that no train needs to wait.
• Sort the arrival and departure times arrays in ascending order.

• Initialize a variable 'platforms' to 1 and 'maxPlatforms' to 1.

• Iterate through the arrival and departure times arrays simultaneously.

• If the current arrival time is less than or equal to the current departure time, increment 'platforms'.

• If ...read more
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Round duration - 30 minutes
Round difficulty - Easy

Q1. What JavaScript questions did he ask you during the managerial round, and can you describe the work culture of his team?
Ans. 
The interviewer asked about JavaScript questions and the work culture of the team during the managerial round.
• JavaScript questions related to closures, prototypes, event handling, and asynchronous programming may have been asked.

• Work culture may involve collaboration, innovation, agile methodologies, and continuous learning.

• Examples of work culture could include regular team meetings, code reviews, hackathons, and ment
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Round duration - 15 minutes
Round difficulty - Easy