PayU Payments Interview Questions, Process, and Tips

Q1. What is api ?
Ans. 
API stands for Application Programming Interface. It is a set of rules and protocols that allows different software applications to communicate with each other.
• APIs define the methods and data formats that applications can use to request and exchange information.

• They allow developers to access the functionality of a system or service without needing to understand its internal workings.

• Examples of APIs include Google Ma...read more
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Q2. What is rest api ?
Ans. 
REST API stands for Representational State Transfer Application Programming Interface. It is a set of rules and protocols for building and interacting with web services.
• REST API is a type of web service that allows communication between different systems over the internet.

• It uses standard HTTP methods like GET, POST, PUT, DELETE to perform operations on resources.

• REST APIs typically return data in JSON or XML format.

• Th...read more
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Q1. Basic information; past experince; CV walkthrough, profile understanding applied for
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Industry update and insights and hypothetical situational QnA

Q1. General and business conversation about the role and responsibility , expectations etc
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Q2. General over view about the role and profile
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Java String Reverse String

Q1. Api Testing, SQL Data Bases related Queries Joints, Selenium Automation, Manual Testing.
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Round duration - 60 Minutes
Round difficulty - Medium

Time - afternoon. 
Interviewer jumped straight into interview, formal and comfortable environment. 
1. Interviewer introduction 
2. Interviewee introduction
3. Coding question 1 - difficulty medium, topic - arrays
- explain approach, write code (pseudo code is fine), dry run on given TCS. 
4. Coding question 2 - same as above, only question was different. Slightly more difficult but on arrays only. 
5. Questions on Python & Django - difficulty medium - write code related to queryset on django objects
6. SQL question to code - 10th highest salary.

Q1. Reverse Only Letters
You are given a string, ‘S’. You need to reverse the string where characters that are not an alphabet stay in the same place, and the rest reverse their positions.
Eg: “a-bcd” become...read more
Ans. 
Key idea - 2 pointer method
Approach - place one pointer p1 on start, 2nd pointer p2 on end. Move p1 to right and p2 to left unless we find a non special character for both, if found for both, swap the values pointed by p1 and p2.
Steps : 
S1 : Pointer p1 at start and p2 at end index
S2 : while p1! = p2 and arr[p1] is special character, move p1 to right
S3 : while p1! = p2 and arr[p2] is special character, move p2 to l...read more
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Q2. Alternate Positive and Negative
You are given an array ‘arr’ that contains an equal number of positive and negative elements. Rearrange the given array such that positive and negative numbers are arranged ...read more
Ans. 
Key idea: Find suitable number for current position on right and swap

Approach : if current idx is even find +ve number on right and if idx is odd find -ve number on right and swap with current position 

S1 : Iterate over the array
S2 : If current index is even find next positive number on right
S3 : If current index is odd find the next negative number on right
S4 : Swap with the current position with found number
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Round duration - 60 Minutes
Round difficulty - Medium

1. Intro of interviewer
2. Intro of interviewee
3. Questions on Python - decorators, static method, class methods
4. Principal of coding, best practices
5. Question on DB - What is indexing, how to improve, best use of indexing.
6. Questions on django - what is django ORM, What is sandbox, Django models, Django queries.
7. Previous job, what do you do, stack you work on.

Very friendly environment, very pleasing person, loved it.

Q1. Basic System Design Questions
What is database indexing?
What is distributed system?
What is hashing?
How is hashing done?
Why time complexity of hashing is O(1)
Ans. 
Tip 1 : Prepare common interview questions of dbms, OS, SQL, CN 
Tip 2 : Prepare how is time complexity calculated
Tip 3 : Know basic terminology of system design
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Round duration - 90 minutes
Round difficulty - Medium

Contained mix of coding, oops and general programming questions

Coding was live coding round
It was around 12pm
They used their own coding environment, I coded in java

Q1. Maximum Subarray Sum
You are given an array (ARR) of length N, consisting of integers. You have to find the sum of the subarray (including empty subarray) having maximum sum among all subarrays.
A subarr...read more
Ans. 
I solved it using partial sums approach

It can be found on geeks for geeks
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Round duration - 90 Minutes
Round difficulty - Hard

It was a collection of HLD AND LLD
Was around 12pm
This was conducted on bluejeans

Q1. System Design Question
Design a URL shorter with db and everything
Ans. 
Tip 1 : always use right kind of database
Tip 2 : think about appropriate design pattern
Tip 3 : think about scaling the application into microservices architecture
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Round duration - 60 Minutes
Round difficulty - Easy

It was a friendly managerial round with director of my team, he was very for me to come on board and explained truthfully how payu is.

Q1. System Design Question
We discussed on some design topics like, pros and cons of microservice architecture and pros and cons of monolithic arch.
Ans. 
Tip 1 : know the difference between different coding architectures
Tip 2 : practice sql and DBA
Tip 3 : read about the company and ask about the team you would be working for
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Round duration - 30 Minutes
Round difficulty - Easy

Just a normal HR discussion, he informed me that I've been selected and we discussed about the salary part

Q1. Basic HR Question
Normal questions about my experience working in corporate
Ans. 
Tip 1 : just be calm and listen to the HR
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Q1. How would you pushback and handle conflict with Managers?
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