PayPal Software Development Engineer Intern Interview Questions and Answers

Logical reasoning, grammar, and coding: two basic level questions.

Q1. Question on core Java
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Q2. Question on SQL and PLSQL
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Q3. Resume based question and on project
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Q1. Resume and project based question
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Q2. What do you like about your current company, and why do you want to join our organization?
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Q1. Merge two sorted linked lists
Ans. 
Merge two sorted linked lists into a single sorted linked list
• Create a new linked list to store the merged result

• Iterate through both input linked lists and compare nodes to determine the order in which they should be added to the result list

• Handle cases where one list is longer than the other
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Q2. Check if paranthesis are balanced or not
Ans. 
To check if parentheses are balanced, use a stack data structure to keep track of opening and closing parentheses.
• Use a stack to push opening parentheses and pop when encountering a closing parenthesis

• If stack is empty when encountering a closing parenthesis, return false

• After iterating through all parentheses, if stack is empty, return true
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Q1. Right view of a Binary Search tree
Ans. 
The right view of a Binary Search Tree shows the nodes that are visible when viewing the tree from the right side.
• The right view of a Binary Search Tree includes the rightmost node at each level.

• Nodes at each level that are not visible from the right side are not included in the right view.

• Example: For the Binary Search Tree with values 1, 2, 3, 4, 5, the right view would be 1, 3, 5.
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Q2. Few javascript questions on how to parse a json object without using inbuilt libraries.
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Q1. Explain the react lifecycle functions and how they work
Ans. 
React lifecycle functions are methods that are automatically called at specific points in a component's life cycle.
• Mounting: constructor, render, componentDidMount

• Updating: render, componentDidUpdate

• Unmounting: componentWillUnmount
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Q2. Css box model, difference between padding and margin
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Padding is the space inside the border of an element, while margin is the space outside the border.
• Padding is used to create space between the content and the border of an element.

• Margin is used to create space between the border of an element and other elements.

• Padding affects the size of the content area, while margin affects the positioning of the element.

• Example: padding: 10px will create 10 pixels of space inside ...read more
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Q1. What are your salary expectations in CTC and variables?
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Q2. Will you relocate to the location required?
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First round basic aptitude questions like profit loss,work time etc

Q1. Tell about youself
Ans. 
I am a software engineer with 5 years of experience in developing web applications using Java, Spring, and Angular.
• 5 years of experience in software development

• Proficient in Java, Spring, and Angular

• Strong problem-solving skills

• Experience in developing web applications

• Good team player
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Q2. Oops concepts and basic implemenation
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Q3. Reverse a number
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Reverse a number by converting it to a string and then reversing the string
• Convert the number to a string

• Reverse the string

• Convert the reversed string back to a number
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Q1. Why this company
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Q2. Are you okay with relocation
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Simple aptitude questions and multiple choice coding questions were asked.

Q1. Explanation about project
Ans. 
I have worked on a project to develop a mobile application for tracking fitness activities and providing personalized workout plans.
• Developed user-friendly interface for inputting and tracking fitness data

• Implemented algorithms to generate personalized workout plans based on user's goals and progress

• Integrated with wearable devices to automatically sync activity data

• Conducted thorough testing to ensure accuracy and rel...read more
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Q2. SQL queries which were easy
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Q3. Linked list and arrays
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1 hour, the coding test was based on a project given to us

Q1. Detailed questionnaire on React
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Q2. Problem solving based on array manipulations
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