National Payments Corporation of India Blockchain Developer Interview Questions and Answers

Q1. What is LMS ?
Ans. 
LMS stands for Learning Management System, a software application for the administration, documentation, tracking, reporting, and delivery of educational courses or training programs.
• LMS helps organizations deliver online courses and training programs to employees or students.

• It allows for the creation and management of courses, assessments, and learning materials.

• LMS can track learner progress, generate reports, and p...read more
Answered by AI
Add your answer
Q2. What is shadow DOM
Ans. 
Shadow DOM is a way to encapsulate the styling and structure of a web component, preventing styles from leaking out or clashing with the rest of the page.
• Shadow DOM allows for creating self-contained components with their own styles and markup

• It helps in preventing styles from the main document affecting the component and vice versa

• Shadow DOM can be created using the 'shadowRoot' property of an element
Answered by AI
Add your answer

Q1. What all exceptions you know ?
Ans. 
Some common exceptions in Salesforce development include DMLException, QueryException, and LimitException.
• DMLException: Thrown when an error occurs while performing DML operations like insert, update, delete.

• QueryException: Thrown when an error occurs while querying data from the database.

• LimitException: Thrown when governor limits are exceeded, such as SOQL query limit or CPU time limit.
Answered by AI
Add your answer
Q2. Have you worked on integration ?
Ans. 
Yes, I have worked on integration in Salesforce development.
• I have experience integrating Salesforce with external systems using REST and SOAP APIs.

• I have worked on integrating Salesforce with third-party applications like MailChimp and DocuSign.

• I have implemented custom integrations using tools like Salesforce Connect and MuleSoft.

• I have experience with data mapping, transformation, and synchronization during integrat
Answered by AI
Add your answer

Q1. Why governor limits ?
Ans. 
Governor limits are in place to ensure efficient use of resources and prevent abuse in Salesforce platform.
• Governor limits help in maintaining system performance and preventing monopolization of resources.

• They ensure fair usage of resources among all users on the platform.

• Examples include limits on number of records retrieved in a single query, number of SOQL queries executed, and CPU time consumed.

• Governor limits also...read more
Answered by AI
Add your answer
Q2. What is challenge you faced ?
Ans. 
One challenge I faced was integrating a third-party API with Salesforce.
• Had to understand the API documentation thoroughly

• Encountered compatibility issues with Salesforce platform

• Implemented custom code to bridge the gap between API and Salesforce
Answered by AI
Add your answer

Q1. Basic question of javascript like temporal dead zone, hoisting
Add your answer
Q2. Basic of sql and mongo
Add your answer

Q1. Logic bluiding question
Add your answer
Q2. 2 leet code quesztion
Add your answer

Q1. Slaray negotiation
Add your answer

Technology advantage or not

All aptitude topics,logical reasoning

Q1. Oops,2 coding questions
Add your answer
Q2. Palindrome,even number
Add your answer

Q1. What do you know
Add your answer
Q2. Do you have any questions
Add your answer

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
Answered by AI
Add your answer
Q2. Two Sum Leetcode problem
Add your answer
Q3. Basic questions based on the candidate technical skills
Add your answer

Q1. Basics to Intermediate level of questions based on the skills mentioned in the resume
Add your answer
Q2. Projects related discussions
Add your answer

Q1. I was informed to upload the supporting documents. ( They rejected me after this eventhough all my documents are genuine )
Add your answer

Simple logical based

Palindrome
Reverse a string

Q1. Oops pillar define and explain
Ans. 
The four pillars of Object-Oriented Programming (OOP) are Abstraction, Encapsulation, Inheritance, and Polymorphism.
• Abstraction: Hides complex implementation details and only shows the necessary features to the outside world.

• Encapsulation: Bundles data and methods that operate on the data into a single unit, preventing direct access to data from outside the class.

• Inheritance: Allows a new class to inherit properties an...read more
Answered by AI
Add your answer

DSA , medium n easy leetcode question was there

Q1. Low level design
Add your answer
Q2. DSA and computer fundamental
Add your answer

Q1. Ask to write code for equal and hashcode in notepad
Add your answer
Q2. Type of Collections and its internal working
Ans. 
Java collections are data structures that store and manipulate groups of objects.
• Types of collections include List, Set, Map, Queue, etc.

• Internal workings involve data structures like arrays, linked lists, hash tables, etc.

• Collections framework provides interfaces and classes for working with collections.
Answered by AI
Add your answer
Q3. Count number of occurrence of string from Array
Ans. 
Count occurrences of a specific string in an array of strings.
• Iterate through the array and use a HashMap to store the count of each string.

• Use the string as key and increment the count each time it is encountered.

• Return the count of the specific string at the end.
Answered by AI
Add your answer
Q4. Write a code using stream
Ans. 
Using stream to filter a list of strings
• Use the filter method to apply a predicate to each element in the stream

• Convert the stream back to a list using the collect method
Answered by AI
Add your answer