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I applied via LinkedIn and was interviewed in Nov 2024. There were 2 interview rounds.
Testing an payment flow on the application
I appeared for an interview in Dec 2021.
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.
You are given a string S
. The task is to reverse the letters of the string while keeping non-alphabet characters in their original position.
S = "...
Reverse the letters of a string while keeping non-alphabet characters in their original position.
Iterate through the string and store the non-alphabet characters in their original positions
Reverse the letters of the string using two pointers technique
Combine the reversed letters with the non-alphabet characters to get the final reversed string
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 a...
Rearrange an array with equal positive and negative numbers alternatively while maintaining relative order.
Iterate through the array and separate positive and negative numbers into two separate arrays.
Merge the two arrays alternatively into the original array.
Ensure the relative order of positive and negative numbers is maintained.
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.
Tip 1 : Good at coding (solving, explaining), especially Dynamic Programming questions like knapsack. Focus 70% time on coding
Tip 2 : Apply to jobs through referral not on company site. Very important.
Tip 3 : Prepare good projects with how to explain in interview.
Tip 4 : Sound very energetic, competitive and some one with eager to learn, so they select you thinking you can be taught things as you have good attitude.
Remember : Good attitude in good coder > Bad attitude in expert coder.
Tip 1 : Max three, projects, which are interesting to talk about, and you have won something for it.
Tip 2 : Leave lot of white space, keep content small and in one page
I appeared for an interview in Jun 2021.
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
Given an array arr
of length N
consisting of integers, find the sum of the subarray (including empty subarray) with the maximum sum among all subarrays.
Find the sum of the subarray with the maximum sum among all subarrays in an array of integers.
Iterate through the array and keep track of the maximum sum subarray seen so far.
Use Kadane's algorithm to efficiently find the maximum subarray sum.
Consider the case where all elements in the array are negative.
Handle the case where the array contains only one element.
Round duration - 90 Minutes
Round difficulty - Hard
It was a collection of HLD AND LLD
Was around 12pm
This was conducted on bluejeans
Design a URL shortener with database and necessary components
Use a unique identifier for each URL to generate short links
Store the original URL and corresponding short link in a database
Implement a redirect mechanism to redirect short links to original URLs
Consider implementing analytics to track usage and performance
Ensure scalability and reliability of the system
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.
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
Tip 1 : have strong grasp of graph based algorithms
Tip 2 : have strong knowledge of data structure
Tip 3 : should be able to find where to use appropriate design pattern
Tip 1 : keep it short and simple
Tip 2 : focus more on design/architecture of project
PayU Payments interview questions for designations
I applied via Referral and was interviewed in Feb 2021. There were 4 interview rounds.
Top trending discussions
I applied via Company Website and was interviewed before Jan 2021. There were 3 interview rounds.
Routing through a proxy involves configuring the proxy server to forward requests to the destination server.
Configure the proxy server to listen for incoming requests
Configure the proxy server to forward requests to the destination server
Configure the client to use the proxy server for outgoing requests
Use a proxy server to bypass network restrictions or improve performance
Examples: Nginx, Apache, Squid
I applied via Naukri.com and was interviewed before Jun 2021. There were 2 interview rounds.
Hacker rank long coding questions with questions for python,c++,javascript , data bast related questions
I appeared for an interview in Jun 2017.
Ajax calls allow for asynchronous communication between client and server without reloading the page.
Ajax stands for Asynchronous JavaScript and XML
Uses XMLHttpRequest object to send and receive data
Allows for partial page updates without reloading the entire page
Can handle data in various formats such as JSON, XML, HTML, and plain text
Example: $.ajax({url: 'example.com', success: function(data){console.log(data)}});
REST is lightweight and uses HTTP while SOAP is XML-based and has more features.
REST uses HTTP methods like GET, POST, PUT, DELETE while SOAP uses XML messaging.
REST is stateless while SOAP can maintain state.
REST is faster and easier to use while SOAP is more secure and reliable.
REST is used for web services while SOAP is used for enterprise-level services.
Example of REST: Twitter API. Example of SOAP: Amazon Web Serv
GET and POST are HTTP methods used for sending data to a server.
GET is used to retrieve data from a server
POST is used to submit data to a server
GET requests can be cached and bookmarked
POST requests are not cached and cannot be bookmarked
GET requests have length restrictions
POST requests have no length restrictions
GET requests are less secure than POST requests
Observer pattern is a design pattern in which an object maintains a list of its dependents and notifies them automatically of any state changes.
Also known as publish-subscribe pattern
Used in event-driven systems
Allows loose coupling between objects
Example: A weather station broadcasts weather updates to multiple displays
Example: A stock market ticker notifies multiple investors of stock price changes
Singleton is a design pattern that restricts the instantiation of a class to a single object.
Singleton ensures that only one instance of a class exists in the entire application.
It provides a global point of access to the instance.
Commonly used in scenarios where a single instance needs to coordinate actions across the system.
Example: Database connection manager, logger, configuration manager.
Immutable in Java refers to objects whose state cannot be changed after creation.
String, Integer, and other wrapper classes are immutable in Java.
Immutable objects are thread-safe and can be shared without synchronization.
To create an immutable class, make all fields final and private, and don't provide setters.
Examples of immutable classes in Java include LocalDate, LocalTime, and LocalDateTime.
Creating immutable in Java
Use final keyword to make variables immutable
Use private constructor to prevent object modification
Use defensive copying to prevent modification of mutable objects
Use enum to create immutable objects
Use String class to create immutable strings
Dependency injection is a design pattern that allows objects to receive dependencies rather than creating them internally.
It helps to decouple the code and makes it more testable and maintainable.
It allows for easier swapping of dependencies without changing the code.
There are three types of dependency injection: constructor injection, setter injection, and interface injection.
Example: Instead of creating a database co...
CORS stands for Cross-Origin Resource Sharing. It is a security feature implemented in web browsers to restrict access to resources from different origins.
CORS allows web servers to specify which origins are allowed to access its resources
It is implemented using HTTP headers
CORS prevents malicious websites from accessing sensitive data from other websites
Examples of resources that may be restricted by CORS include cook
CORS can be overcome by configuring the server to allow cross-origin requests.
Configure the server to include the Access-Control-Allow-Origin header
Use JSONP (JSON with Padding) to bypass CORS restrictions
Use a proxy server to make the request on behalf of the client
Use a browser extension to disable CORS restrictions during development
Use a server-side proxy to forward requests to the target server
I applied via Referral
My biggest achievement till date is successfully leading a team to develop and launch a new software product ahead of schedule.
Led a team of developers to create a new software product
Completed the project ahead of schedule
Received positive feedback from clients and stakeholders
I would address conflicts directly and respectfully, seeking to understand the root cause and find a mutually beneficial solution.
Listen actively to understand the other person's perspective
Communicate clearly and respectfully
Identify the root cause of the conflict
Brainstorm potential solutions together
Be willing to compromise and find a mutually beneficial solution
Success is achieving personal goals, feeling fulfilled, and making a positive impact.
Success is subjective and can vary from person to person.
It involves setting and achieving goals, both short-term and long-term.
Feeling fulfilled and content with one's accomplishments is a key aspect of success.
Making a positive impact on others or the world can also be a measure of success.
Success is not just about material wealth or...
Dijkstra's algorithm finds the shortest path between nodes in a graph.
Create a graph with nodes and edges
Assign a tentative distance to each node
Set the initial node as current and mark it visited
For each neighbor of the current node, calculate the tentative distance
If the tentative distance is less than the current distance, update the distance
Mark the current node as visited and select the unvisited node with the sma...
A program to reverse a singly linked list
Create a new empty linked list
Traverse the original linked list and insert each node at the beginning of the new list
Return the new list
Methods to find nth largest element in an unsorted linked list
Traverse the linked list and store elements in an array, sort the array and return the nth largest element
Use quickselect algorithm to find the nth largest element in O(n) time complexity
Implement a max heap and extract the nth largest element
Divide the linked list into smaller sublists and recursively find the nth largest element
Use merge sort to sort the l
A prime number is a number that is divisible only by 1 and itself.
A prime number has exactly two factors: 1 and itself.
Prime numbers cannot be divided evenly by any other number.
Examples of prime numbers include 2, 3, 5, 7, 11, 13, 17, etc.
Test cases for a bank transaction
Transaction amount within account balance limit
Transaction amount exceeds account balance limit
Transaction to a valid account number
Transaction to an invalid account number
Transaction with correct transaction code
Transaction with incorrect transaction code
Transaction during bank working hours
Transaction outside bank working hours
Design classes for educational institutions in a city
Identify the main entities: schools, students, teachers, courses
Create a School class with attributes like name, address, and a list of students and teachers
Create a Student class with attributes like name, age, and a list of courses
Create a Teacher class with attributes like name, specialization, and a list of courses
Create a Course class with attributes like name, ...
I applied via Campus Placement and was interviewed in Dec 2016. There were 5 interview rounds.
Paypal is a leading online payment platform with a strong reputation and global presence.
Paypal is a well-established and trusted online payment platform used by millions of users worldwide.
It offers secure and convenient payment options for both individuals and businesses.
Paypal has a strong focus on innovation and technology, making it an exciting place to work for software engineers.
Working at Paypal provides opport...
Paypal is a digital payment platform that allows individuals and businesses to make online transactions.
Paypal provides a secure way to send and receive money online.
It allows users to link their bank accounts, credit cards, or debit cards to their Paypal account.
Users can make payments to merchants or individuals using their Paypal balance or linked payment methods.
Paypal offers buyer and seller protection, dispute re...
In 5 years, I see myself as a senior software engineer leading a team of developers on innovative projects.
Continuing to enhance my technical skills and knowledge through ongoing learning and certifications
Taking on more leadership responsibilities and mentoring junior team members
Contributing to the development of cutting-edge software solutions
Building strong relationships with colleagues and stakeholders to drive pr
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