Juspay Interview Experience for Internship | On-Campus 2020

21 Feb, 2022
Juspay is one of the largest firms in India in terms of providing Mobile payment solutions. Juspay visited our campus for hiring for an Internship. They have shortlisted around 600 students to give an online Coding Test at the Talscale Platform.
Interview Round consists of 3 rounds on-campus and 2 rounds + 1 hackathon at their Juspay office-Bangalore.
On-campus Rounds
Round 1 (Coding Test): 3 Graph-based question
Given the graph consist of pair and weight attached to it. Print out the node having the maximum number of inorder weights. (Node having maximum sum weight ).Given the graph, Print out the maximum weight Cycle of the graph. ( Cycle which has maximum sum weight ).Given the 2 nodes. Print the shortest path between them. ( Return the array containing the path).
Given the graph consist of pair and weight attached to it. Print out the node having the maximum number of inorder weights. (Node having maximum sum weight ).
Given the graph, Print out the maximum weight Cycle of the graph. ( Cycle which has maximum sum weight ).
Given the 2 nodes. Print the shortest path between them. ( Return the array containing the path).
I was able to solve 1 complete and 1 partial 
Around 23 students moving to the next round.
Round 2 (Technical Interview): All student is given 2 coding questions and those who solved it are only able to give an interview.
Write a Program to parse the JSON format file.Write a Program for basic Linux commands like – mkdir, cd, pwd, cp.
Write a Program to parse the JSON format file.
Write a Program for basic Linux commands like – mkdir, cd, pwd, cp.
I was able to write a Program and given the Interview
No Introduction or anything directly he started with Coding questions
Check the given binary tree is BST or not – solved in 5 minutes, given a recursive approach O(n) solution
Check the given binary tree is BST or not – solved in 5 minutes, given a recursive approach O(n) solution
Seem to be Impressed, He started asking a question about machine learning as it is my minor
What is Bayes theorem, write its formula and its application?What are the Naive Bayes Classifier and its importance?
What is Bayes theorem, write its formula and its application?
What are the Naive Bayes Classifier and its importance?
Few questions from Operating questions like
TCP belongs to which OSI Layer?Difference Between Thread and Process?
TCP belongs to which OSI Layer?
Difference Between Thread and Process?
I was a Little nervous and giving answers taking breaks then He asks me to wait outside for the result.
After they took a few more interviews for a student and selected 2 Students for the next round.
Round 3 (Technical Interview): Only 1 coding question
Given a K sorted array, Merge them in a sorted single 1d array in the least complexity
Given a K sorted array, Merge them in a sorted single 1d array in the least complexity
I solved it and was selected for the Final Interview at Juspay Office Bangalore with 1 other. They have taken care of our flight tickets and hotel rooms.
Juspay Office – 1 Day Hackathon and 2 interviews round
Hackathon: In the Hackathon, We have to make a Rotating Cube using Typescript as per given some conditions on angle and axis.
I never heard this language before and didn’t know even how to declare a variable, Somehow they are given time to learn and code. I manage to take a reference from online resources and make a cube but it’s not rotating at all. 
Round 1: Technical Interview – Taken by senior Developer
Theory Question is from Linked List, Arrays, String and Graphs and few questions on my projects and last about 2 hours
Final Round – Taken by CEO of Juspay
He asked questions from the N-ary tree
Locking and Unlocking of Resources arranged in the form of n-ary Tree: https://www.geeksforgeeks.org/locking-and-unlocking-of-resources-in-the-form-of-n-ary-tree/ 
My Complexity
isLock()  O(1) 
Lock()    O(N)
unLock()  O(1)
I was not able to solve in the given Time limit which is O(Logn) for all operations. Hence, he rejected me.
There was one more round of HR but not for me.
Result: Rejected
Although I enjoyed the whole interview process and get to learn so much from it and also a free trip to Bangalore.
I would like to thank GeeksforGeeks. Initially, I practiced the topic wise, later when I was confident enough I started practicing company-wise. Also, I made it a habit to read at least one interview experience from gfg daily.
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