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Dunzo Software Development Engineer Interview Questions and Answers

Updated 23 Jul 2024

Dunzo Software Development Engineer Interview Experiences

1 interview found

Interview experience
5
Excellent
Difficulty level
Moderate
Process Duration
2-4 weeks
Result
Selected Selected

I applied via Referral and was interviewed before Jul 2023. There were 3 interview rounds.

Round 1 - Coding Test 

2 Leetcode medium to hard level questions were given. Time: 1hr

Round 2 - Coding Test 

2 Leetcode medium to hard level questions were given. Time: 1hr

Round 3 - One-on-one 

(1 Question)

  • Q1. Describe the project mentioned in resume.

Interview Preparation Tips

Interview preparation tips for other job seekers - Practice Leetcode medium level problems. Be prepared with your projects mentioned in resume.

Top trending discussions

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Indian Startups
2w
a senior executive
One of the best sources for Startup investment: DAHEJ(DOWRY)
You won't believe my senior has a good corporate job with over 10 years of experience. But suddenly resigned just a few days after his wedding. We all thought maybe he got married and wants to spend his time with his wife, and decided to go to his place to give him a proper farewell. All of us got shocked after knowing that he left because his father-in-law gifted him a fat cash amount and a car in the name of "blessings." He’s using the money to fund his startup and the car for "business movement." I mean seriously? People are now using dowry as startup capital and walking around acting like CEOs, playing boss with someone else’s money. Bas, shaadi karo aur apne sapne chalu karo, courtesy sasural. I don't know feeling inspired? Or disgusted?
Got a question about Dunzo?
Ask anonymously on communities.

Interview questions from similar companies

I appeared for an interview before Sep 2020.

Round 1 - Face to Face 

(2 Questions)

Round duration - 60 Minutes
Round difficulty - Easy

  • Q1. 

    0/1 Knapsack Problem Statement

    A thief is planning to rob a store and can carry a maximum weight of 'W' in his knapsack. The store contains 'N' items where the ith item has a weight of 'wi' and a value of...

  • Ans. 

    Yes, the 0/1 Knapsack problem can be solved using dynamic programming with a space complexity of not more than O(W).

    • Use a 1D array to store the maximum value that can be stolen for each weight capacity from 0 to W.

    • Iterate through each item and update the array based on whether including the item would increase the total value.

    • The final value in the array at index W will be the maximum value that can be stolen.

  • Answered by AI
  • Q2. 

    Find the Second Largest Element

    Given an array or list of integers 'ARR', identify the second largest element in 'ARR'.

    If a second largest element does not exist, return -1.

    Example:

    Input:
    ARR = [2,...
  • Ans. 

    Find the second largest element in an array of integers.

    • Iterate through the array to find the largest and second largest elements.

    • Handle cases where all elements are identical.

    • Return -1 if a second largest element does not exist.

  • Answered by AI
Round 2 - Video Call 

(1 Question)

Round duration - 60 Minutes
Round difficulty - Easy

System Design Round

  • Q1. Design a system for Twitter, discussing its architecture, key components, and scalability considerations.
  • Ans. 

    Design a scalable system for Twitter with key components and architecture.

    • Use microservices architecture for scalability and fault isolation.

    • Key components include user service, tweet service, timeline service, and notification service.

    • Use a distributed database like Cassandra for storing tweets and user data.

    • Implement a message queue like Kafka for handling real-time updates and notifications.

    • Use a caching layer like ...

  • Answered by AI
Round 3 - HR 

Round duration - 30 Minutes
Round difficulty - Easy

It is just a formality

Interview Preparation Tips

Professional and academic backgroundI applied for the job as SDE - 1 in BangaloreEligibility criteriaResume shortlistingSwiggy interview preparation:Topics to prepare for the interview - OOPS, Data Structures, Core Java, Algorithms, DBMS, SQL,Time required to prepare for the interview - 3 monthsInterview preparation tips for other job seekers

Tip 1 : System Design
Tip 2 : Practice questions from leetcode
Tip 3 : Have some projects.

Application resume tips for other job seekers

Tip 1 : Mention what you know 
Tip 2 : Good previous work to showcase

Final outcome of the interviewSelected

Skills evaluated in this interview

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I applied via Campus Placement and was interviewed in Jun 2021. There was 1 interview round.

Interview Questionnaire 

4 Questions

  • Q1. Y r u choosing this job only??
  • Q2. What's your dream?
  • Ans. 

    My dream is to create innovative software solutions that positively impact people's lives and drive technological advancement.

    • Building User-Centric Applications: I aspire to develop applications that prioritize user experience, like a health tracking app that motivates users to lead healthier lives.

    • Contributing to Open Source: I dream of contributing to open-source projects, collaborating with developers worldwide to c...

  • Answered by AI
  • Q3. My dream is to got a job
  • Q4. How much salary will you expected??

Interview Preparation Tips

Interview preparation tips for other job seekers - My advice is to be positive at any situation and be active .
Don't get feared .
Your dressing is shown ur attitude.
Give respect to the others don't forget these things.
Interview experience
3
Average
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
Selected Selected

I applied via LinkedIn and was interviewed before Aug 2023. There were 2 interview rounds.

Round 1 - Technical 

(2 Questions)

  • Q1. Push notifications
  • Q2. DATA STRUCTURE with js
  • Ans. 

    Data structures are used to store and organize data in a computer so that it can be accessed and manipulated efficiently.

    • Data structures in JavaScript include arrays, objects, sets, and maps.

    • Arrays are used to store a collection of elements, accessed by index.

    • Objects are used to store key-value pairs.

    • Sets are used to store unique values.

    • Maps are used to store key-value pairs with keys of any type.

  • Answered by AI
Round 2 - Technical 

(2 Questions)

  • Q1. Timer in react native
  • Ans. 

    In React Native, timers can be implemented using the setTimeout and setInterval functions.

    • Use setTimeout for a one-time delay before executing a function.

    • Use setInterval for executing a function repeatedly at a specified interval.

    • Remember to clear the timer using clearTimeout or clearInterval when no longer needed.

  • Answered by AI
  • Q2. Find occurance of elements in array
  • Ans. 

    Count occurrences of elements in an array of strings

    • Iterate through the array and use a hashmap to store the count of each element

    • Use a for loop to go through each element and increment the count in the hashmap

    • Return the hashmap with element counts

  • Answered by AI

Skills evaluated in this interview

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

(4 Questions)

  • Q1. Explain Deadlock?
  • Ans. 

    Deadlock is a situation in computing where two or more processes cannot proceed because each is waiting for the other to release resources.

    • Occurs in multi-threaded environments when processes hold resources and wait for others.

    • Example: Process A holds Resource 1 and waits for Resource 2, while Process B holds Resource 2 and waits for Resource 1.

    • Can lead to system inefficiency and unresponsiveness.

    • Deadlock detection and...

  • Answered by AI
  • Q2. Explain Red Black Tree?
  • Ans. 

    A Red-Black Tree is a balanced binary search tree with specific properties to ensure efficient operations.

    • Each node is colored either red or black.

    • The root node is always black.

    • Red nodes cannot have red children (no two reds in a row).

    • Every path from a node to its descendant leaves must have the same number of black nodes.

    • This structure ensures O(log n) time complexity for insertion, deletion, and search operations.

    • Exa...

  • Answered by AI
  • Q3. Find local minima in a 1-D array?
  • Q4. Find local minima in 2-D array?
  • Ans. 

    Local minima in a 2-D array are elements smaller than their neighbors. We can find them using various algorithms.

    • A local minimum is defined as an element that is less than its adjacent elements.

    • For example, in the array [[9, 8, 7], [6, 5, 4], [3, 2, 1]], the element 1 is a local minimum.

    • To find local minima, iterate through each element and compare it with its neighbors (up, down, left, right).

    • Consider edge cases where...

  • Answered by AI

Skills evaluated in this interview

I appeared for an interview in Apr 2021.

Round 1 - Coding Test 

(2 Questions)

Round duration - 60 minutes
Round difficulty - Easy

The round consisted of 2 coding Problems and it lasted for 60 minutes from 12:00 PM to 1:00 PM on Hackerearth.
Use of other IDEs was prohibited and video was on.

  • Q1. 

    Implement indexOf Function

    You are provided with two strings A and B. Your task is to find the index of the first occurrence of A within B. If A is not found in B, return -1.

    Example:

    Input:
    A = "bc", ...
  • Ans. 

    Implement a function to find the index of the first occurrence of one string within another string.

    • Iterate through the second string and check if a substring of the same length as the first string matches the first string.

    • Return the index of the first occurrence of the first string within the second string, or -1 if not found.

    • Handle edge cases like empty strings or when the first string is longer than the second string...

  • Answered by AI
  • Q2. 

    Problem: Search In Rotated Sorted Array

    Given a sorted array that has been rotated clockwise by an unknown amount, you need to answer Q queries. Each query is represented by an integer Q[i], and you must ...

  • Ans. 

    Search for integers in a rotated sorted array efficiently.

    • Implement binary search to find the target integer in the rotated array.

    • Handle the rotation by checking which side of the array is sorted before performing binary search.

    • Return the index of the target integer if found, else return -1.

    • Time complexity of O(logN) is required for each query.

  • Answered by AI
Round 2 - Face to Face 

(1 Question)

Round duration - 60 minutes
Round difficulty - Medium

The round was conducted on Google Meet with 2 interviewers . They were friendly and helpful.
The timing was 12:00 to 1:00 PM.
Our Video was on .

  • Q1. 

    Distinct Subsequences Problem Statement

    You are given a string 'S' of length 'N' which may include duplicate alphabets. Your goal is to calculate the number of distinct subsequences in the string.

    Exampl...

  • Ans. 

    Calculate the number of distinct subsequences in a string with possible duplicates.

    • Use dynamic programming to keep track of the count of distinct subsequences for each character in the string.

    • Consider the cases where the current character is included or excluded in the subsequence.

    • Handle duplicates by considering the previous occurrence of the character.

    • Return the count of distinct subsequences modulo 10^9 + 7.

  • Answered by AI
Round 3 - HR 

Round duration - 60 minutes
Round difficulty - Easy

This was a Behavioral Round. It lasted for 45-50 minutes. It consisted of a discussion on my projects. The interviewer was very impressed by the way I explained my projects. She even appreciated me for that. This was followed by normal HR questions .Timing of This round was 4:00 PM to 5:00 PM

Interview Preparation Tips

Professional and academic backgroundI completed Computer Science Engineering from Guru Gobind Singh Indraprastha University. I applied for the job as SDE - 1 in HyderabadEligibility criteriaAbove 8 CGPAUrban Clap interview preparation:Topics to prepare for the interview - Dynamic Programming, OOPS, Operating System, DBMS, Greedy Algorithms, Computer NetworksTime required to prepare for the interview - 3 monthsInterview preparation tips for other job seekers

Tip 1 : I prepared all topics from my Coding Ninjas Course - Competitive Programming
Tip 2 : I practiced 300+ questions on CodeZen ( Coding Ninjas Platform), LeetCode, InterviewBit
Tip 3 : I took part in contests on CodeForces.
Tip 4 : Apart from Data Structures and Algorithms , I also studied DBMS, OOPs and other course subjects

Application resume tips for other job seekers

Tip 1 : Keep Resume up to date for the role you are applying.
Tip 2 : Mention atleast 1 project or past work experience.
Tip 3 : Try to keep a 1 pager resume.

Final outcome of the interviewSelected

Skills evaluated in this interview

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

Sorting of an array and aptitude

Round 2 - Technical 

(1 Question)

  • Q1. BFS graph traversal
Round 3 - Technical 

(1 Question)

  • Q1. Binary tree question
Are these interview questions helpful?
Interview experience
5
Excellent
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
Selected Selected

I applied via Campus Placement and was interviewed before May 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 tips
Round 2 - Aptitude Test 

Basic maths, logical resoning, puzzles

Round 3 - Coding Test 

Competitive Programming on Dynamic Programming, Java code debug, SQL qurries

Interview Preparation Tips

Topics to prepare for Paisabazaar.com Software Development Engineer interview:
  • DSA
  • React.Js
  • SQL
  • Git
Interview preparation tips for other job seekers - In interview DSA was asked. I had to write pseudo code of BFS and explain its time complexity
Interview experience
4
Good
Difficulty level
-
Process Duration
-
Result
-
Round 1 - Online Assessment 

(3 Questions)

  • Q1. Hard Stock sell problem
  • Ans. 

    The hard stock sell problem involves determining the best time to sell stocks to maximize profit.

    • Consider using dynamic programming to solve this problem efficiently.

    • Keep track of the minimum stock price seen so far and calculate the maximum profit that can be made by selling at each day.

    • The final answer will be the maximum profit that can be made by selling at the last day.

  • Answered by AI
  • Q2. Create a server without express
  • Ans. 

    Creating a server without using Express framework

    • Use Node.js built-in 'http' module to create a server

    • Listen for incoming requests on a specific port

    • Handle different routes and methods using 'http' module

  • Answered by AI
  • Q3. What is singleton class, write a usecase through code
  • Ans. 

    Singleton class is a class that can only have one instance created throughout the application.

    • Singleton class restricts the instantiation of a class to one object.

    • It is often used for logging, caching, thread pools, database connections, etc.

    • Example: Java implementation of Singleton class -

    • public class Singleton { private static Singleton instance; private Singleton() {} public static Singleton getInstance() { if(insta...

  • Answered by AI

Interview Preparation Tips

Interview preparation tips for other job seekers - Learn node, express basics(basics means covering whole basic groud not touch and go) like about making servers (with or without express) and emitters. Have a good hold of basic DSA till atleast till linked list and few dp questions(easy ones). Have some projects or internships if fresher. If frontend learn react hooks, state management, redux.

This all should do it, chao!! 😄

Skills evaluated in this interview

Interview experience
4
Good
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
Not Selected

I applied via LinkedIn and was interviewed in May 2024. There were 3 interview rounds.

Round 1 - Technical 

(4 Questions)

  • Q1. What is event loop, how it works.
  • Ans. 

    Event loop is a mechanism in programming that allows for asynchronous execution of code by continuously checking for and handling events.

    • Event loop is commonly used in JavaScript to handle asynchronous operations like setTimeout, setInterval, and AJAX requests.

    • It works by continuously checking the event queue for any pending events, executing them one by one, and then moving on to the next event.

    • Event loop helps in pre...

  • Answered by AI
  • Q2. Micro task queue and macro task queue.
  • Q3. Is node.js single threaded or multi-threaded, also discuss threadpool and it's usages.
  • Q4. Tell the order of output, among process, promise, setTimeout, fs, setInterval.
  • Ans. 

    The order of output is fs, process, setTimeout, setInterval, promise.

    • fs module is synchronous and will output first

    • process is next in line

    • setTimeout will be executed after process

    • setInterval will be executed after setTimeout

    • promise will be executed last

  • Answered by AI
Round 2 - Technical 

(4 Questions)

  • Q1. JavaScript usages compiler or interpreter.
  • Ans. 

    JavaScript is an interpreted language.

    • JavaScript is an interpreted language, meaning it is executed line by line at runtime.

    • There is no separate compilation step in JavaScript like in languages that use compilers.

    • Examples of interpreted languages include Python, Ruby, and PHP.

  • Answered by AI
  • Q2. Tell the output among various for loops using var, let and bind.
  • Ans. 

    Output comparison of for loops using var, let, and bind in JavaScript.

    • Using var: variable is function-scoped, may lead to unexpected behavior in loops.

    • Using let: variable is block-scoped, recommended for loop iterations.

    • Using bind: creates a new function with a specified 'this' value and initial arguments.

  • Answered by AI
  • Q3. A medium level dsa question on array, solved it using pre-sum.
  • Q4. Situation based question, on how to pick a suitable database.
  • Ans. 

    Choosing a database involves evaluating data structure, scalability, consistency, and specific use cases.

    • Understand data structure: Use SQL for structured data (e.g., PostgreSQL) and NoSQL for unstructured data (e.g., MongoDB).

    • Consider scalability: Choose databases like Cassandra for horizontal scaling in large applications.

    • Evaluate consistency needs: Use strong consistency databases like MySQL for critical transaction...

  • Answered by AI
Round 3 - Technical 

(4 Questions)

  • Q1. What do you do on daily basis, and how to decide a tech-stack on high level.
  • Ans. 

    I work on coding, debugging, testing, and collaborating with team members. Tech stack decisions are based on project requirements, scalability, performance, and team expertise.

    • Daily tasks include coding, debugging, testing, and collaborating with team members

    • Tech stack decisions are based on project requirements, scalability, performance, and team expertise

    • Consider factors like language compatibility, libraries/framewo...

  • Answered by AI
  • Q2. Design an online scalable, real-time document sharing application like google docs.
  • Ans. 

    Design a scalable, real-time document sharing app like Google Docs.

    • Use websockets for real-time collaboration

    • Implement version control to track changes

    • Utilize a distributed database for scalability

    • Include user authentication and access control

    • Support offline editing with automatic sync

  • Answered by AI
  • Q3. How to handle images also in the future.
  • Ans. 

    Utilize cloud storage for scalability, implement image compression techniques, and regularly update image processing libraries.

    • Utilize cloud storage for scalability

    • Implement image compression techniques

    • Regularly update image processing libraries

  • Answered by AI
  • Q4. Any other way to solve the problem, of high I/O on same document to overcome throughput and conflicts.
  • Ans. 

    Implement strategies like versioning, sharding, and caching to manage high I/O and reduce conflicts on the same document.

    • Use versioning to track changes and allow concurrent edits without conflicts. For example, implement optimistic locking.

    • Implement sharding to distribute the load across multiple servers, reducing the I/O on a single document.

    • Utilize caching mechanisms to store frequently accessed data in memory, mini...

  • Answered by AI

Skills evaluated in this interview

Dunzo Interview FAQs

How many rounds are there in Dunzo Software Development Engineer interview?
Dunzo interview process usually has 3 rounds. The most common rounds in the Dunzo interview process are Coding Test and One-on-one Round.

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Overall Interview Experience Rating

5/5

based on 1 interview experience

Difficulty level

Moderate 100%

Duration

2-4 weeks 100%
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