Chargebee interview experience Real time questions & tips from candidates to crack your interview

Software Engineer

Chargebee

3 rounds | 4 Coding problems

Ajit Kumar

Fresher | Mar 2022

Selected

Interview preparation journey

Journey

I started coding in 2nd year of college; I also participated in many coding contests on almost every coding platform, which gave me confidence. So, I suggest participating in every coding contest.

Application story

I got this opportunity on campus. I answered very well in my interview and was truthful about my project explanation. Don't try to copy-paste your project if you haven't done it on your own.

Why selected/rejected for the role?

I got selected for the software development role because I gave my answers very well, and the interviewer was very satisfied with all of my answers. Also, if I did not know the answer, I said I didn't know.

Preparation

Duration: 6 months

Topics: Data Structures, Algorithms, Operating Systems, OOPS, some basics of DBMS

Tip

Tip 1 : Be regular
Tip 2 : Be sincere
Tip 3 : Build a good cv

Application process

Where: Campus

Eligibility: Above 7 CGPA

Resume tip

Tip 1: Be honest. Don't lie to make it look big
Tip 2: Be brief

Interview rounds

Round

Medium

Online Coding Interview

Duration90 mins

Interview date19 Mar 2022

Coding problem1

1. Prime Permutations

Moderate

15m average time

85% success

0/80

Asked in company

You are given an integer, ‘N’. Your task is to determine the total number of different permutations of the numbers from 1 to ‘N’, such that in every such permutation, all prime numbers within the range, 1 to ‘N’ are present at prime indices(1-indexed), and composite numbers at composite indices.

Note:

1. The permutation [1,4,3,2] is not a valid permutation because 2 is a prime number and thus it should be placed at a prime index but in this permutation, it is placed at index 4(1-indexed). Also, at index 2, a prime number should have been placed as 2 is a prime number but here, 4 is placed which is not a prime number. So, this is an invalid permutation.

2. The permutation [1,3,2,4] is a valid permutation because 2 and 3 are prime numbers, so index 2 and index 3 are prime indices. In this permutation, prime numbers are placed at prime indices only and composite numbers are placed at composite indices so this is a valid permutation.

Try solving now

Round

Medium

Video Call

Duration60 mins

Interview date26 Mar 2022

Coding problem2

1. OOPS Questions

Difference between Abstract class and Interface.(Learn)

Problem approach

The differences between Abstract Class and Interface are as follows :

Abstract Class :

1) Abstract classes have a default constructor and it is called whenever the concrete subclass is instantiated.
2) It contains Abstract methods as well as Non-Abstract methods.
3) The class which extends the Abstract class shouldn’t require the implementation of all the methods, only Abstract
methods need to be implemented in the concrete sub-class.
4) Abstract class contains instance variables.

Interface :

1 ) It doesn’t have any constructor and couldn’t be instantiated.
2) The abstract method alone should be declared.
3) Classes that implement the interface should provide the implementation for all the methods.
4) The interface contains only constants.

2. UNIX Question

Explain any 5 essential UNIX commands .

Problem approach

1) ls -> Lists files in current directory
2) cd -> Change directory to tempdir
3) mkdir -> Make a directory called graphics
4) rmdir -> Remove directory (must be empty)
5) cp -> Copy file into directory

Round

Easy

HR Round

Duration45 mins

Interview date31 Mar 2022

Coding problem1

1. Basic HR Question

Tell me about yourself.
tell me about your project.
Why should we hire you ?

Problem approach

Tip 1 : The cross questioning can go intense some time, think before you speak.

Tip 2 : Be open minded and answer whatever you are thinking, in these rounds I feel it is important to have opinion.