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Doubtnut Data Science Engineer Interview Questions and Answers

Updated 18 Apr 2024

Doubtnut Data Science Engineer Interview Experiences

1 interview found

Interview experience
2
Poor
Difficulty level
-
Process Duration
-
Result
-

I applied via Referral

Round 1 - Aptitude Test 

What is BST and it's types?

Round 2 - Coding Test 

Tell me the count of string

Interview Preparation Tips

Interview preparation tips for other job seekers - NA

Interview questions from similar companies

I applied via Job lever and was interviewed before Sep 2021. There were 2 interview rounds.

Round 1 - Coding Test 

Easy leetcode code 2 questions , HTML5 css javascript simple screen design

Round 2 - One-on-one 

(1 Question)

  • Q1. Oop, Simple coding javascript, react basic, sql basic

Interview Preparation Tips

Interview preparation tips for other job seekers - Take it easy and go with confidence which matters most

I applied via LinkedIn and was interviewed in May 2021. There was 1 interview round.

Interview Questionnaire 

1 Question

  • Q1. Basic questions of the tech stack that I applied for.

Interview Preparation Tips

Interview preparation tips for other job seekers - Prepare for the technologies you apply and just be confident because they want hire someone who is confident know at least basics of the tech stack.

I was interviewed before Sep 2020.

Round 1 - Coding Test 

(1 Question)

Round duration - 120 minutes
Round difficulty - Easy

It was a mix of mathematical aptitude, logical ability, and puzzles along with 2 programming questions of easy and medium level. Time was enough and no sectional time was present. 1-2 MCQs on SQL were also present.

This round was immediately followed by an SHL aptitude test which was basically a quick limited time check of your verbal ability and math because many questions were to be done in 1 hour.

  • Q1. 

    Boolean Matrix Transformation Challenge

    Given a 2-dimensional boolean matrix mat of size N x M, your task is to modify the matrix such that if any element is 1, set its entire row and column to 1. Specifi...

  • Ans. 

    Modify a boolean matrix such that if any element is 1, set its entire row and column to 1.

    • Iterate through the matrix and mark rows and columns to be modified

    • Use additional arrays to keep track of rows and columns to be modified

    • Update the matrix in-place based on the marked rows and columns

  • Answered by AI
Round 2 - Video Call 

Round duration - 60 minutes
Round difficulty - Easy

It was an online video interview round on HackerEarth with simultaneous code option. It was mostly justifying your resume in the first 15 minutes. After that OOPS was majorly asked. Basics of programming including questions on STL were asked. A class which required inheritance was asked by the interviewer to write. I was helped by the interviewer if i got stuck somewhere, Some questions on implementation of hashmaps and priority queues were also asked. A puzzle was asked which luckily struct to me at that moment.

Interview Preparation Tips

Professional and academic backgroundI completed Computer Science Engineering from Dronacharya College of Engineering. I applied for the job as Software Engineer in DelhiEligibility criteria7 CGPAToppr interview preparation:Topics to prepare for the interview - DBMS, OOPS, Data structures, Dynamic Programming, Graphs, Algorithms, Sorting searching, Compiler designTime required to prepare for the interview - 4 monthsInterview preparation tips for other job seekers

Tip 1 : Never give up
Tip 2 : When u start a topic, don't move on to next topic before you are 100% confident in previous topic
Tip 3 : Try to give maximum time on basics of a topic especially OOPS
Tip 4 - Practice Atleast 250 Questions
Tip 5 - Ex- Do atleast 2 projects

Application resume tips for other job seekers

Tip 1 : Write only those things in resume in which you are 100% confident
Tip 2 : Write maximum projects you have and be ready to explain them thoroughly
Tip 3 : Don't make any silly spelling mistakes on resume

Final outcome of the interviewSelected

Skills evaluated in this interview

Interview experience
4
Good
Difficulty level
-
Process Duration
-
Result
-
Round 1 - Aptitude Test 

Basic aptitude questions

Round 2 - Coding Test 

Linked list, array, tree and graph questions

Interview Preparation Tips

Interview preparation tips for other job seekers - Prepare well aptitude and coding
Interview experience
4
Good
Difficulty level
-
Process Duration
-
Result
-
Round 1 - Coding Test 

Coding test around front end using react

Interview experience
3
Average
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
Selected Selected

I applied via Job Portal and was interviewed before Nov 2023. There were 3 interview rounds.

Round 1 - Technical 

(2 Questions)

  • Q1. Question on Binary trees: if symmetric, easy string question using hashmap
  • Q2. If we are hosting a live test how to show real time ranking, HLD for this and what algorithms can we use
Round 2 - Technical 

(1 Question)

  • Q1. Database schema design for a feature where user can be free, gold, platinum.
  • Ans. 

    Use a user table with a column for user type (free, gold, platinum)

    • Create a user table with columns for user ID, name, email, user type

    • Use a separate table for user types with columns for type ID and type name

    • Establish a one-to-many relationship between user and user type tables

    • Example: user table - user_id, name, email, type_id; user_type table - type_id, type_name

  • Answered by AI
Round 3 - Technical 

(1 Question)

  • Q1. HLD for live rank dashboard for a live test where millions of users are doing test
  • Ans. 

    High-level design for a live rank dashboard for a live test with millions of users.

    • Use a scalable architecture to handle millions of users concurrently.

    • Implement real-time data processing to update ranks dynamically.

    • Utilize caching mechanisms to improve performance and reduce load on the database.

    • Design a user-friendly interface with intuitive data visualization.

    • Include features for filtering, sorting, and searching to

  • Answered by AI

Skills evaluated in this interview

Interview experience
5
Excellent
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
Selected Selected

I applied via Referral and was interviewed before Sep 2023. There were 4 interview rounds.

Round 1 - Coding Test 

Two Medium DSA problem to solve

Round 2 - Technical 

(1 Question)

  • Q1. Design scalable Streaming pipeline and
  • Ans. 

    Design a scalable streaming pipeline for processing large volumes of data.

    • Use a distributed streaming framework like Apache Kafka or Apache Flink for real-time data processing.

    • Implement data partitioning and parallel processing to handle high data throughput.

    • Utilize cloud services like AWS Kinesis or Google Cloud Pub/Sub for scalability and reliability.

    • Include fault tolerance mechanisms like checkpointing and data repl...

  • Answered by AI
Round 3 - Technical 

(1 Question)

  • Q1. LLD round , write classes and its methods
Round 4 - HR 

(1 Question)

  • Q1. Salary and benefits discussion

Skills evaluated in this interview

Interview experience
4
Good
Difficulty level
Easy
Process Duration
Less than 2 weeks
Result
Selected Selected

I applied via Naukri.com and was interviewed before Jul 2022. There were 3 interview rounds.

Round 1 - Resume Shortlist 
Pro Tip by AmbitionBox:
Keep your resume crisp and to the point. A recruiter looks at your resume for an average of 6 seconds, make sure to leave the best impression.
View all Resume tips
Round 2 - One-on-one 

(3 Questions)

  • Q1. Basics of js and react
  • Q2. What are closures and give an example
  • Ans. 

    Closures are functions that have access to variables from their outer scope even after the outer function has finished executing.

    • Closures are created when a function is defined within another function and has access to the outer function's variables.

    • They can access variables from the outer function even after the outer function has returned.

    • Closures are commonly used in event handlers and callbacks in JavaScript.

  • Answered by AI
  • Q3. What is event loop and features of es5
  • Ans. 

    Event loop is a mechanism that allows JavaScript to perform non-blocking operations by handling asynchronous events.

    • Event loop is responsible for executing code, collecting and processing events, and executing queued sub-tasks.

    • ES5 features include strict mode, JSON object, Array methods like forEach, map, filter, and reduce, and Object.create method.

    • ES5 also introduced new methods for manipulating strings, such as trim

  • Answered by AI
Round 3 - One-on-one 

(1 Question)

  • Q1. General management round and past experience

Skills evaluated in this interview

Interview experience
5
Excellent
Difficulty level
-
Process Duration
-
Result
-
Round 1 - Technical 

(1 Question)

  • Q1. Concepts of node and Js
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Doubtnut Interview FAQs

How many rounds are there in Doubtnut Data Science Engineer interview?
Doubtnut interview process usually has 2 rounds. The most common rounds in the Doubtnut interview process are Aptitude Test and Coding Test.

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Doubtnut Data Science Engineer Interview Process

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