CA-One Tech Cloud Java Developer Interview Questions and Answers

Tasked with creating a to-do list application using the MERN stack.

Q1. What are the reasons for your choice of this company?
Ans. 
I chose this company for its innovative projects, strong company culture, and opportunities for growth.
• Innovative projects: I was impressed by the company's track record of developing cutting-edge software solutions.

• Strong company culture: I value a supportive and collaborative work environment, which I believe this company offers.

• Opportunities for growth: I see potential for career advancement and skill development wi
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Q1. Can you provide a detailed explanation of your experience with Node.js?
Ans. 
I have extensive experience with Node.js, including building backend APIs, real-time applications, and server-side rendering.
• Developed RESTful APIs using Express framework

• Implemented real-time features with Socket.io

• Utilized Node.js for server-side rendering with frameworks like Next.js

• Experience with npm package management and creating custom modules
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Q1. Scenario of microservice saga pattern
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Q2. Given an integer array segregate odd and even numbers without using another array
Ans. 
Segregate odd and even numbers in an integer array without using another array
• Iterate through the array and maintain two pointers, one for odd numbers and one for even numbers

• Swap elements at the odd and even pointers until all odd numbers are on one side and even numbers on the other

• Example: Input array [3, 6, 8, 5, 4], Output array [6, 8, 4, 5, 3]
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What is OOPS concepts?

Q1. What is frontend
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Q2. What is backend
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It was ok. I was not able to solve all the questions.

Q1. Remove the last element from a linkedlist
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Q2. Some basic questions on oops dbms and os
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Q1. Asked about technologies and coding
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Q2. Components in reactjs
Ans. 
Reactjs components are reusable, independent pieces of UI that can be composed together to build complex user interfaces.
• Components are the building blocks of a React application

• They can be class components or functional components

• Components can have their own state and lifecycle methods

• Components can be nested within other components to create a hierarchy

• Examples: Button component, Navbar component, UserList component
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Q3. Given url to fetch data from api
Ans. 
Use the url to make a request to the API and fetch data.
• Use a library like axios or fetch to make the HTTP request.

• Parse the response data to extract the necessary information.

• Handle any errors that may occur during the request.
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Q4. Cloud related scenerio questions
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Simple question on maths

Q1. Explain OOPS concept
Ans. 
OOPS (Object-Oriented Programming) is a programming paradigm based on the concept of objects, which can contain data and code.
• OOPS focuses on creating objects that interact with each other to solve complex problems

• Key principles include encapsulation, inheritance, polymorphism, and abstraction

• Encapsulation ensures that the internal state of an object is hidden from the outside world

• Inheritance allows a class to inherit...read more
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Q2. Coding array questions
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