Udaan.com Interview Experience by Sanjana Bharti | Full Time

It was conducted on HackerEarth Platform.
There was only one Coding Question:-

A problem statement with user flows defined in the form of APIs ( Movie Ticket Reservation System ).
All APIs mentioned in the problem statement should be implemented correctly with expected functionality

Students whose at least 9/10 test cases passed made it for the Next Round.

(Structured and Organized Code with Better Workflow were given an Edge)

There was one API Design Question:

Design and implement an application to reserve flights based on source, destination and date.
APIs:

Search for flights based on source, destination, and date
User being able to reserve 'n' number of seats on a particular fight (this API should keep availability of seats on that flight in mind)
View reservations for users (both past and upcoming)

A google link was provided to submit the zip files.
Students who provided the full working code were shortlisted for the next Round.

The interviewer introduced himself and asked me to do the same.

Some general Questions like-

What technologies you have worked on.
What are the things do you consider before choosing any new tech stack.
What problems did you face in switching languages from C++ to Python, how much time did it take to learn new language, etc

He asked me to share screen and explain the code written in 2nd Round followed by certain cross Questions -:

What happens in case of multiple user trying to book same seat, discuss Various approaches for handling Concurrency in your system .

Difference between Mutex,semaphore, Exclusive and shared locks, when to use them,etc.
Discussion about Concurrent and Synchronized in java, Different Data Structures using them, and their implementation.
Discussion about different approaches to scale our system.

what additional features do you expect from user perspective, how to implement them and system design aspect of all the features i mentioned( Notifications, Recommendations ,Better ways for UI )

Discussion about one of the projects in my resume with certain follow ups
Why did you use this tech stack , and SQLite as Database, How is it better than the ones used in your other projects.
Did you Deploy it, How did it help in real life ?
What will be your strategy to get people know about a fresh product you are deploying in market, discussion about business and advertisement scenario.

He asked me about the previous Rounds
In Depth Discussion about any one of your projects in resume (apart from that discussed in previous round )
What was your motive for making this project, why didn’t you deploy it ?
( Since my project included transport layer protocols)
Will the sockets you used in your project work fine while travelling in train or any adverse network condition.
Implement a socket which can be efficient in terms of both reliability and speed using the existing sockets in my project, discussion about different methods of handling packet loss.
Discussion about Web Sockets and system Design aspects of whatsapp and instagram .
Discussion about the other projects from my resume.
What is your approach toward learning any new thing, how do you increase its productivity ?

Any Questions for me ?
I asked few
- Why isn’t Data Structure, algorithm and competitive coding there in any of the rounds of Udaan , just like most of the other product and software companies have?
- What is the approach of the team for choosing technology for developing any big real time product from scratch?
- What are the most important skill set required for becoming a good product Developer?

Result : Selected :)

Sanjana Bharti

CSE 2k21

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