National Payments Corporation of India Software Developer Interview Questions and Answers

78 mcq questions and 2 dsa

Coding based round on dsa

Normal MCQ questions on JS

Write a program to use debouncing in frontend

Q1. Behavioural questions
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Q2. Why this company and why you?
Ans. 
I am passionate about the company's innovative projects and believe my skills align well with the team's goals.
• I have been following the company's work closely and am impressed by their commitment to cutting-edge technology.

• I believe my experience in software development, particularly in the areas of machine learning and AI, would be a valuable addition to the team.

• I am excited about the opportunity to work with a tale...read more
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Q1. REST API for User CRUD
Ans. 
Design a RESTful API for CRUD operations on user resources.
• Use HTTP methods like GET, POST, PUT, DELETE for CRUD operations

• Create endpoints like /users for listing all users, /users/{id} for specific user

• Use status codes like 200 for success, 404 for not found, 400 for bad request

• Implement authentication and authorization mechanisms for security

• Include request and response body formats like JSON or XML
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Q2. Two Sum Leetcode problem
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Q3. Basic questions based on the candidate technical skills
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Q1. Basics to Intermediate level of questions based on the skills mentioned in the resume
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Q2. Projects related discussions
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Q1. I was informed to upload the supporting documents. ( They rejected me after this eventhough all my documents are genuine )
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Online zoom coding test will be there - 4 questions - 2 about output of code & 2 about technical questions.

Q1. Polymorphism and explain about virtual polymorphism
Ans. 
Polymorphism is the ability of a single function or method to operate on different types of data.
• Polymorphism allows objects of different classes to be treated as objects of a common superclass.

• Virtual polymorphism is achieved through virtual functions in C++.

• Virtual functions allow a function in a base class to be overridden in a derived class.

• Example: Animal class with virtual function 'makeSound' overridden in Dog a...read more
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Q2. Write code for virtual polymorphism and explain
Ans. 
Virtual polymorphism allows objects of different classes to be treated as objects of a common superclass.
• Create a base class with virtual functions

• Create derived classes that override the virtual functions

• Use pointers or references of the base class to call the overridden functions
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Q1. About yourself should explain
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Q2. Reason for job change
Ans. 
I seek new challenges and opportunities for growth that align with my career goals and aspirations in software development.
• Career Growth: I'm looking for a position that offers more opportunities for advancement, such as leading projects or mentoring junior developers.

• Skill Development: I want to work with new technologies and frameworks that will enhance my skill set, like transitioning from Java to modern cloud techn...read more
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Q3. Salary negotiations and location
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It was a 1 Hour aptitude test along a few MCQ based questions on DSA.

Q1. The interview was held online. The interview first asked me to explain any one of my projects.
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Q2. Asked a a few basic question of DSA like difference between quick and merge sort. Time complexities of a few algorithms. Real life application of Trees.
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Q3. A few basic questions related to OOPs
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Q4. Find missing numbers in a list in Python. (He asked me a few concepts related to Python since most of my projects were made in that)
Ans. 
Identify and return missing numbers from a given list in Python using various methods.
• Use a set to find missing numbers: Convert the list to a set and compare with a complete set of numbers.

• Example: Given list [1, 2, 4, 6], complete set is {1, 2, 3, 4, 5, 6}. Missing: {3, 5}.

• Utilize list comprehension: Create a list of numbers in the range and filter out those present in the original list.

• Example: [n for n in range(1, ...read more
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Q5. If A,B both classes have a function with same name (lets say the name of function id FUN) and C is a child of both. So, if FUN is called for C what will happen in Python and in C++.
Ans. Will give an error in C++, But will call FUN from whichever parent was declared first in Python
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Q6. He also asked me to implement quick sort
Ans. 
Quick sort is an efficient sorting algorithm that uses a divide-and-conquer approach to sort elements in an array.
• 1. Choose a 'pivot' element from the array. Example: In [3, 6, 8, 10, 1, 2, 1], choose 6 as pivot.

• 2. Partition the array into two sub-arrays: elements less than the pivot and elements greater than the pivot.

• 3. Recursively apply the above steps to the sub-arrays. Example: [3, 1, 2] and [8, 10] after partitio...read more
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Aptitude auestions were there

In this round 14 mcq and 2 sql queries were given