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PayPal Interview Questions

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About PayPal

PayPal democratizes financial services and empowers people and businesses to participate in and succeed in the global economy, fueled by a core belief that having access to financial services creates opportunity. Their open digital payments infrastructure empowers account holders to interact and transact in new and powerful ways, whether online, on a mobile device, through an app, or in person. PayPal delivers ways to manage and move money through a combination of technological innovation and strategic partnerships and gives choice and freedom when sending payments, paying, or receiving payments.

Paypal creates unforgettable experiences for our customers, whether they are merchants, consumers, or members of the PayPal community. Working as a team, taking ownership and accountability, making decisions, and achieving goals are all important at Paypal. Paypal needs global minds to come up with fresh ideas for making money secure and accessible to everyone. One can look through their job listings to see if any of them are a good fit. 

PayPal Recruitment Process

Interview Process

PayPal offers on-campus interviews as well as online job postings. If you're applying online, the first step is to find a suitable job position and submit your CV and cover letter. Candidates who can communicate what they're doing, describe their ambitions, and express their passion to join PayPal are shortlisted.

Interview Rounds

The interview procedure is rather easy, and it usually consists of four stages:

  1. Online Test: You can expect two questions with 14 test cases each on the online test.
  2. Technical interview Round 1: This lasts an hour, and you can expect code questions. A few commonly asked code questions are on DSA. 
  3. Technical interview Round 2: This is likewise an hour-long round with questions primarily based on your resume. You can expect questions on algorithms or be given a set of non-negative integers and a value sum and asked to identify if there is a subset of the provided set with a sum equal to a specified sum.
  4. Managerial Round: The final phase, the managerial round, lasts roughly 45 minutes and includes a combination of technical and behavioural questions. You may be given real-life examples and instructed to address the problems using which OOPs (Object-Oriented Programming System) idea. Queries concerning prior internships and other questions based on your resume can also be expected.

PayPal Technical Interview Questions: Freshers and Experienced

1. What is functional programming in JavaScript?

A programming paradigm designed to handle pure mathematical functions is known as functional programming. The emphasis in this is on writing more complex and pure functions.

Because JavaScript is a multi-paradigm language, we may simply combine a variety of paradigms within a single piece of JavaScript code. In JavaScript, we can employ object-oriented, procedural, and functional programming paradigms all at once. What makes JavaScript so attractive and powerful is that it is multi-paradigm and allows us to interact with a variety of programming languages. 

2. What is a callback function?

A callback function is a function that is supplied as an input to another function and then invoked inside the outer function to finish a routine or operation. Here is an example: 

function greeting(name) {
  alert('Hello ' + name);
}

function processUserInput(callback) {
  var name = prompt('Enter the name here.');
  callback(name);
}

processUserInput(greeting);

3. What is an event loop?

The event loop is the key to asynchronous programming in JavaScript. Although JS executes all operations on a single thread, it offers the appearance of multi-threading through the use of a few clever data structures. The call stack is in charge of keeping track of all the actions in the queue that need to be completed. When a function completes, it is removed from the stack. The event queue is in charge of transmitting new functions to the track so that they can be processed. It maintains the correct sequence in which all operations should be sent for execution by using the queue data structure.

4. Describe the singleton pattern.

The singleton pattern is a software design pattern in software engineering that limits the instantiation of a class to one "single" instance. This is beneficial when only one item is required to coordinate system-wide actions. 

One of the most basic design patterns is the singleton. Sometimes we just need one instance of our class, such as a single DB connection shared by numerous objects, because making a separate DB connection for each object could be expensive. Similarly, instead of developing many managers, an application might have a single configuration manager or error manager that handles all problems.

5. What is RDBMS?

Database management systems that maintain data records and indexes in tables are known as relational database management systems (RDBMS). It is possible to construct and maintain relationships between and among the data and tables. Tables are used to express relationships between data elements in a relational database. Data values, not pointers, are used to define interdependencies between these tables. This gives you a lot of data independence. An RDBMS may recombine data items from several files, giving it powerful data-handling capabilities.

6. What is Node.js? Where can you use it?

Node JS is a framework for easily creating fast and scalable network applications based on Chrome's JavaScript runtime. Because of its single-threaded nature, it's best suited for non-blocking, event-driven servers.

7. What are functions and their usage in SQL?

SQL functions are short bits of code that are commonly used and reused in database systems to process and manipulate data. The measured values are the functions. It always accomplishes a certain goal. When constructing functions, keep the following rules in mind:

  • A function must be given a name, which cannot begin with a special character such as @, $, #, or other characters.
  • Only SELECT statements can be used by functions.
  • It compiles every time a function is called.
  • Functions are required to return a value or a result.
  • Input parameters are always utilised with functions.

8. Explain the features of Hadoop.

The following are some of the key features of Hadoop:

  • It's a freeware framework based on open-source code.
  • Hadoop is compatible with a wide range of hardware and makes it simple to add new hardware to a node.
  • Hadoop enables data processing to be dispersed more quickly.
  • The data is stored in a cluster that is separate from the rest of the operations.
  • Hadoop allows you to make three clones of each block, each with a distinct node.

9. What is the difference between events and callbacks in Node.js?

Although Events and Callbacks appear to be the same, the difference is that callback functions are invoked when an asynchronous function delivers a result, whereas event handling uses the observer pattern. When an event is fired, the listener function begins to run. The events module and the EventEmitter class, which are used to bind events and event listeners, provide a number of built-in events in Node.js.

10. What is the use of the debugger keywords in JavaScript?

The JavaScript debugger keyword places a breakpoint in the code. The debugger halts the program's execution at the point where it is applied. We can now manually begin the execution flow. If an exception occurs, the execution will come to a complete stop on that line.

11. Give an example of shuffle() method?

This method shuffles the string or array that is sent to it. It shuffles the array's contents. The random module contains this method. As a result, we must first import it before calling the function. When the function is called, it shuffles the elements and produces various results.

12. How is memory managed in Python?

In Python, memory is handled in the following ways:

  • Python's private heap space is in charge of memory management. A private heap holds all Python objects and data structures. This secret heap is not accessible to the programmer. Instead, the python interpreter takes care of it.
  • Python's memory management is in charge of allocating heap space for Python objects. The core API allows programmers access to some programming tools.
  • Python also includes a garbage collector built-in, which recycles all unused memory and makes it available to the heap space.

13. What are the rules for a local and global variable?

  • Variables at the Global Level: 
    • Global variables are variables declared outside of a function or in a global space.
    • If a variable is ever given a new value within the function, it is implicitly local, and we must explicitly declare it as 'global.' We must declare a variable using the global keyword to make it global.
    • Any function can access and modify the value of global variables from anywhere in the programme.
  • Variables in the Local Environment: 
    • A local variable is any variable declared within a function. This variable exists only in local space, not in global space.
    • It's presumed that a variable is local if it gets a new value anywhere in the function's body.
    • Only the local body has access to local variables.

14. What is the namespace in Python?

  • The namespace is a basic concept for structuring and organising code that is especially beneficial in large projects. If you're new to programming, however, it may be a challenging notion to grasp. As a result, we attempted to make namespaces a little more understandable.
  • A namespace is a basic method of controlling the names in a programme. It ensures that names are distinct and will not cause confusion.
  • Python also uses dictionaries to handle namespaces and maintains a name-to-object mapping, with names acting as keys and objects acting as values.

15. What are the features of the Java Programming language?

The Java Programming Language has the following features:

  • Java is a simple language to learn. Java's syntax is based on C++, making it easier to build programmes in it.
  • Object-Oriented: Java adheres to the object-oriented paradigm, allowing us to maintain our code as a collection of various types of objects that include both data and behaviour.
  • Read-once, write-anywhere: Java supports the read-once, write-anywhere technique. On any machine, we can run the Java software. Java programmes (.java) are translated to bytecode (.class) that can execute on any machine. Platform Independence: Java is a cross-platform programming language. It differs from other programming languages, such as C and C++, which require a platform to run. Java comes with its own platform, which is used to run its code. The execution of Java is not dependent on the operating system.
  • Java is safe because it does not make use of explicit references. Java also has the ByteCode and Exception handling concepts, making it more secure.
  • Java is a robust programming language because it makes extensive use of memory management. It is more robust thanks to features like automatic garbage collection, exception handling, and so on.

16. What are the main differences between the Java platform and other platforms?

The following are the distinctions between the Java platform and other platforms:

  • Other platforms may be hardware platforms or software-based platforms, but Java is a software-based platform.
  • Other hardware platforms can only contain the hardware components, whereas Java is processed on top of them.

17. What is a classloader?

The Classloader subsystem of the JVM is responsible for loading class files. The classloader loads the java programme first whenever we execute it. In Java, there are three built-in classloaders.

  • Bootstrap ClassLoader: The initial classloader, which is the superclass of Extension classloader, is Bootstrap ClassLoader. It loads the rt.jar file, which includes all Java Standard Edition class files such as java.lang package classes, java.net package classes, java.util package classes, java.io package classes, java.sql package classes, and so on.
  • Extension ClassLoader: This is the parent classloader of the System classloader and the child classloader of Bootstrap. The jar files in the $JAVA HOME/jre/lib/ext directory are loaded.
  • System/Application ClassLoader: Extension classloader's child classloader is System/Application ClassLoader. The class files are loaded from the classpath. The classpath is set to the current directory by default. The "-cp" or "-classpath" switches can be used to alter the classpath. Application class loader is another name for it.

18. What is the purpose of static methods and variables?

The class's static methods or variables are shared by all of the class's objects. The static property belongs to the class, not the object. We don't need to build the object to access the static variables because they're stored in the class area. As a result, static is utilised when we need to create variables or methods that are shared by all of the class's objects.

19. What is binary search?

Sorted lists or arrays can be searched with a binary search. This search chooses the midway, dividing the full list into two sections. The centre is compared first.

The target value is initially compared to the middle of the list in this search. If it is not located, it makes a judgement on whether to proceed.

20. How are insertion sort and selection sort different?

Both insertion and selection sorting techniques keep two sub-lists, sorted and unsorted, and place one element at a time into the sorted sub-list. Insertion sort takes the currently selected element and places it in the sorted array at the right point while keeping the insertion sort attributes. Selection sort, on the other hand, looks for the smallest element in an unsorted sub-list and replaces it with the current element.

21. How do you find the depth of a binary tree?

Code to find the depth of a binary tree:

# To find out the max depth of a tree
class Node:
 
    # To create a new node
    def __init__(self, data):
        self.data = data
        self.left = None
        self.right = None
 
# Find the maxDepth of a tree i.e. the no. of nodes on the longest path from root node down to leaf node
def maxDepth(node):
    if node is None:
        return -1 ;
 
    else :
 
        # Compute the depth of each subtree
        lDepth = maxDepth(node.left)
        rDepth = maxDepth(node.right)
 
        # Use the larger one
        if (lDepth > rDepth):
            return lDepth+1
        else:
            return rDepth+1
 
 
# Driver program to test above function
root = Node(1)
root.left = Node(2)
root.right = Node(3)
root.left.left = Node(4)
root.left.right = Node(5)
 
 
print ("The height of the tree is %d" %(maxDepth(root)))

22. How would you print the nodes in a circular linked list?

def circularList(self):
 
   temp = self.head
     
   if self.head is not None:
       while(True):
          
           # To print the nodes till we reach 1st node
           print(temp.data, end = " ")
           temp = temp.next
           if (temp == self.head):
               break

Additional Useful Interview Resources:

PayPal Interview Preparation

Interview Preparation Tips

  • Read about the company: Read about Paypal, what software they use, and try to apply it to your projects, how it works, and so on. 
  • Prepare for common interview questions: Choose a list and consider the questions you're most likely to face, and practice them.
  • Practice for Mock Interviews: With the list of questions you’ve prepared, practice for mock interviews with colleagues. 
  • Make a list of questions to ask: Preparing for a job interview includes thinking of the correct questions to ask. Create some questions based on your research that indicate a genuine interest in the position and the organization. 
  • Check the interview experiences of those placed in Paypal.

PayPal Coding Interview Questions

Max Sum Contiguous Subarray
Arrays
Solve Problem
Zigzag String
Strings
Solve Problem
Good Graph
Graph Data Structure & Algorithms
Solve Problem
Convert the amount in number to words
Strings
Solve Problem
Minimum Absolute Difference
Time Complexity
Solve Problem

Frequently Asked Questions

1. How do I pass a PayPal interview?

PayPal takes a candidate-friendly attitude even during on-campus rounds, but it looks beyond your technical talents and expertise. Two independent technical rounds precede a face-to-face interview with the hiring manager, which sets PayPal apart from other software businesses.

Three significant aspects influence the interview process:

  • What is important to you? 
  • How do you work? 
  • What do you require to advance and succeed?

2. Why do you want to work at PayPal?

PayPal is a value-driven organisation driven by its core values of collaboration, innovation, wellness and inclusion. I would want to be in a collaborative work culture wherein I’ll be able to contribute to the team as well as develop my career.

3. How can I introduce myself in a technical interview?

You can talk about your journey into technology when asked to introduce yourself. What drew you to coding in the first place, and why was web development (or other job-specific skills) a good fit for you? What does that have to do with our job or our company's objectives?

4. Does PayPal pay a good salary?

The typical PayPal pay ranges from around 4.7 lakhs for an Operational Risk Officer to 76.8 lakhs for a Director. Salary estimates are based on 2.4k PayPal salaries from a variety of PayPal employees. 

5. Do PayPal interns get paid?

Yes, Paypal interns do get paid. Undergraduate and graduate students can work on real, relevant initiatives that help PayPal's business and customers through internships.

6. What is the Eligibility Criteria for Paypal?

Eligibility Criteria and Required Skills for PayPal Recruitment:

  • Branches of BTech (CSE, IT, CSE with Bioinformatics) are eligible to participate in the PayPal hiring procedure.
  • The candidate must have a minimum CGPA of 7 in order to continue with his or her studies.
  • The candidate must have received a minimum of 70% in grades X and XII.
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