Juspay Technologies Product Solution Engineer Interview Questions and Answers

Q1. Internal Implementation of HashMap
Ans. 
HashMap is implemented using an array of linked lists to handle collisions.
• HashMap stores key-value pairs in an array of linked lists

• Hash function is used to determine the index of the array where the key-value pair will be stored

• Collision handling is done by chaining, where multiple key-value pairs with the same hash value are stored in the same linked list

• HashMap allows null keys and values

• HashMap is not synchronized...read more
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Test was based on arrays and some dsa concepts.

Hacker earth , Rest api consuming and filtering response . 2 question

Q1. L1 Technical of 1 hour - Java , Spring Boot, OOPs
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Q2. JAVA 8 Features , OOPs Concept
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Q1. L2 technical , design , puzzle
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Q1. With CTO , recent projects , puzzle
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Q1. Directly discussion on expected
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Javascript,html, CSS and MySQL

Q1. Basic NodeJs and MySQL questions,scenario-based technical questions and basic interview questions
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Q2. What is an event loop, The second highest from the table
Ans. 
An event loop is a programming construct that waits for and dispatches events or messages in a program.
• Event loop is commonly used in asynchronous programming to handle tasks like I/O operations without blocking the main thread.

• It continuously checks for events in a queue and processes them one by one.

• Examples of event loops include Node.js event loop for handling asynchronous operations in JavaScript.

• Event loop helps ...read more
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Q1. Basic nodejs and SQL queries question
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Q1. Basic interview question and technology based
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Q1. Does Java support pass by reference?
Ans. 
Yes
• Java uses pass by value for all variables, including object references.

• When an object reference is passed as an argument, a copy of the reference is passed, not the actual object.

• Modifying the reference inside the method will not affect the original reference outside the method.

• However, modifications to the object's state inside the method will be visible outside the method.
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Q2. Explain Singleton Pattern
Ans. 
Singleton pattern restricts the instantiation of a class to a single object.
• Singleton pattern ensures that only one instance of a class exists throughout the 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.
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Q1. Java 8 questions along with solving a Hashing question
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Questions on SQL and Problem solving

Q1. Why this role and salary discussion
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Practice medium leetcode questions

Q1. System Design and database design
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Q1. What are your salary expectations?
Ans. 
I am open to discussing salary based on the responsibilities and opportunities offered by the position.
• I am flexible and open to negotiation.

• I am looking for a fair and competitive salary.

• I value the opportunity to grow and develop in my career.

• I am willing to consider other benefits and perks in addition to salary.
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Q2. What is your family background?
Ans. 
My family background is diverse and includes individuals from various professions and cultural backgrounds.
• My father is a doctor and my mother is a teacher.

• I have an older brother who is an engineer.

• My grandparents were farmers and owned a small business.

• We have relatives living in different countries, which has exposed me to different cultures and traditions.
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Q3. Share details of your previous job.
Ans. 
I worked as a Software Developer at XYZ Company.
• Developed and maintained software applications using Java and Python.

• Collaborated with cross-functional teams to gather requirements and design solutions.

• Implemented new features and fixed bugs in existing software.

• Performed code reviews and provided feedback to improve code quality.

• Participated in Agile development processes and attended daily stand-up meetings.

• Worked on...read more
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Q4. Why should we hire you?
Ans. 
I have a strong technical background and a passion for software development.
• I have a solid understanding of programming languages and software development principles.

• I have experience working on various software projects and have a track record of delivering high-quality code.

• I am a quick learner and adapt easily to new technologies and frameworks.

• I am a team player and enjoy collaborating with others to solve complex ...read more
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Q5. Why are you looking for a change?
Ans. 
Seeking new opportunities for professional growth and challenges.
• Looking for a more challenging role

• Want to expand my skill set

• Seeking better career prospects

• Interested in working with new technologies

• Want to work in a more collaborative environment
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Q6. Where do you see yourself in 5 years?
Ans. 
In 5 years, I see myself as a senior software developer leading a team and working on complex projects.
• Leading a team of developers

• Working on complex projects

• Continuously learning and staying updated with new technologies

• Contributing to the growth and success of the company
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Q7. What are your strengths and weaknesses?
Ans. 
My strengths include problem-solving, attention to detail, and teamwork. My weaknesses include time management and public speaking.
• Strengths: problem-solving, attention to detail, teamwork

• Weaknesses: time management, public speaking
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Q8. Tell me about yourself.
Ans. 
I am a software developer with experience in various programming languages and a passion for creating innovative solutions.
• Experienced in Java, C++, and Python

• Developed a web application using React and Node.js

• Worked on a team to create a mobile app for iOS and Android

• Strong problem-solving and analytical skills
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