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Cognizant React Developer Interview Questions and Answers
7 Interview questions
Error handling in React can be done using try-catch blocks, error boundaries, and handling asynchronous errors.
Use try-catch blocks to handle synchronous errors
Use error boundaries to catch errors in child components
Handle asynchronous errors using promises or async/await
Use third-party libraries like Sentry or Bugsnag for better error tracking
Display user-friendly error messages to improve user experience
To avoid re-rendering, use shouldComponentUpdate or React.memo
Use shouldComponentUpdate to compare current and next props/state
Use React.memo to memoize functional components
Use useMemo to memoize expensive computations
Use useCallback to memoize event handlers
Use PureComponent for class components
useState and useEffect are React Hooks used for managing state and side effects respectively.
useState is used to manage state in functional components
It returns an array with two elements - the current state value and a function to update the state
useEffect is used to manage side effects like fetching data or updating the DOM
It takes a function as its argument and runs it after every render
useEffect can also take ...
componentWillUnmount is a lifecycle method in React that is called right before a component is unmounted and destroyed.
componentWillUnmount is used to perform any necessary cleanup tasks before a component is removed from the DOM.
It is commonly used to cancel any pending network requests, remove event listeners, or clear timers or intervals.
The method is called automatically by React when a component is about to b...
What people are saying about Cognizant
Optimize React apps by improving performance, reducing load times, and enhancing user experience through various techniques.
Use React.memo to prevent unnecessary re-renders of functional components.
Implement code splitting with React.lazy and Suspense to load components only when needed.
Utilize the useCallback and useMemo hooks to memoize functions and values, reducing recalculations.
Optimize images and assets to ...
Refs are a way to access DOM nodes or React components directly. They can be used to get input values.
Refs provide a way to access DOM nodes or React components directly.
They are commonly used to get input values or trigger imperative animations.
Refs can be created using the `createRef()` method or by using a callback function.
To get the value of an input using refs, you can assign a ref to the input element and a...
Lazy Loading and Suspense are techniques used to improve performance by loading components and data only when needed.
Lazy Loading delays the loading of non-critical resources until they are needed, reducing initial load time.
Suspense allows components to wait for data to load before rendering, improving user experience.
Lazy Loading and Suspense can be used together to optimize performance and user experience.
Examp...
Cognizant React Developer Interview Experiences
1 interview found
Anonymous
I applied via Naukri.com and was interviewed in Mar 2021. There was 1 interview round.
Interview Questionnaire
7 Questions
- Q1. What are the ways to handle Errors in React?
- Q2. What are refs? How will you use it for getting input value? Explain with code.
- Ans.
Refs are a way to access DOM nodes or React components directly. They can be used to get input values.
Refs provide a way to access DOM nodes or React components directly.
They are commonly used to get input values or trigger imperative animations.
Refs can be created using the `createRef()` method or by using a callback function.
To get the value of an input using refs, you can assign a ref to the input element and access...
- Q3. Explain useState, useEffect Hooks.
- Ans.
useState and useEffect are React Hooks used for managing state and side effects respectively.
useState is used to manage state in functional components
It returns an array with two elements - the current state value and a function to update the state
useEffect is used to manage side effects like fetching data or updating the DOM
It takes a function as its argument and runs it after every render
useEffect can also take a sec...
- Q4. What is Lazy Loading, Suspense. How do they work?
- Ans.
Lazy Loading and Suspense are techniques used to improve performance by loading components and data only when needed.
Lazy Loading delays the loading of non-critical resources until they are needed, reducing initial load time.
Suspense allows components to wait for data to load before rendering, improving user experience.
Lazy Loading and Suspense can be used together to optimize performance and user experience.
Example: A...
- Q5. How componentWillUnmount works?
- Ans.
componentWillUnmount is a lifecycle method in React that is called right before a component is unmounted and destroyed.
componentWillUnmount is used to perform any necessary cleanup tasks before a component is removed from the DOM.
It is commonly used to cancel any pending network requests, remove event listeners, or clear timers or intervals.
The method is called automatically by React when a component is about to be unm...
- Q6. How do you avoid re-rendering of a component? With useEffect second parameter, should ComponentUpdate
- Ans.
To avoid re-rendering, use shouldComponentUpdate or React.memo
Use shouldComponentUpdate to compare current and next props/state
Use React.memo to memoize functional components
Use useMemo to memoize expensive computations
Use useCallback to memoize event handlers
Use PureComponent for class components
- Q7. How to optimize React App? Important Question
- Ans.
Optimize React apps by improving performance, reducing load times, and enhancing user experience through various techniques.
Use React.memo to prevent unnecessary re-renders of functional components.
Implement code splitting with React.lazy and Suspense to load components only when needed.
Utilize the useCallback and useMemo hooks to memoize functions and values, reducing recalculations.
Optimize images and assets to decre...
Interview Preparation Tips
Skills evaluated in this interview
Interview questions from similar companies
I applied via Campus Placement and was interviewed before May 2021. There were 4 interview rounds.
VERBAL QUANT DI/LR and Picture based test
(1 Question)
- Q1. Write a fibonaci series in c++ or C?
- Ans.
Fibonacci series can be easily implemented using loops in C++ or C.
Declare variables for first two numbers of the series
Use a loop to calculate and print the next number in the series
Repeat the loop until desired number of terms are printed
(1 Question)
- Q1. Informed about the policies and made us sign a document
Interview Preparation Tips
Skills evaluated in this interview
Interview Questionnaire
1 Question
- Q1. Tell me about software system
I applied via Referral and was interviewed before Jan 2021. There was 1 interview round.
Interview Questionnaire
1 Question
- Q1. What is abstract class, what is list, SQL,ADO.net
- Ans.
Abstract class is a class that cannot be instantiated, List is a collection of objects, SQL is a language used to manage databases, ADO.net is a framework for accessing databases.
Abstract class is used as a base class for other classes
List is a generic collection of objects
SQL is used to create, modify, and query databases
ADO.net provides a set of classes for accessing databases
Example: abstract class Animal { public a...
Interview Preparation Tips
Skills evaluated in this interview
What people are saying about Cognizant
I applied via Company Website and was interviewed before Jan 2021. There were 5 interview rounds.
Interview Questionnaire
3 Questions
- Q1. Tell me about yourself?
- Q2. Normalization concept,Java basics inheritance overloading, encapsulation ,update table ,related to projects in final year
- Q3. Situation based questions based on project
Interview Preparation Tips
All the Best😊😊
I applied via Naukri.com and was interviewed in Jul 2020. There were 3 interview rounds.
Interview Questionnaire
4 Questions
- Q1. Tell me about yourself?
- Ans.
I'm a passionate software developer with 5 years of experience in building scalable web applications and a strong focus on user experience.
Experience in full-stack development using technologies like React, Node.js, and MongoDB.
Led a team project that improved application performance by 30% through code optimization.
Strong background in Agile methodologies, having participated in multiple sprints and retrospectives.
Dev...
- Q2. What are your Strengths?
- Ans.
I excel in problem-solving, collaboration, and adaptability, which enhance my effectiveness as a software developer.
Strong problem-solving skills: I enjoy tackling complex coding challenges, like optimizing algorithms for better performance.
Effective collaboration: I have successfully worked in Agile teams, contributing to projects like a web application that improved user engagement.
Adaptability: I quickly learn new t...
- Q3. What are your Weakness?
- Ans.
I tend to be overly critical of my work, which can slow down my progress and affect my confidence in delivering projects.
I often spend too much time refining code, which can delay project timelines. For example, I once spent an extra week on a feature.
I sometimes struggle with delegation, preferring to handle tasks myself to ensure quality. This was evident in a group project where I took on too much.
I can be hesitant ...
- Q4. What are your salary expectations?
- Ans.
I am looking for a competitive salary that reflects my skills and experience in software development.
Based on my research, the average salary for a software developer in this region is between $80,000 and $100,000.
I have over 5 years of experience in full-stack development, which I believe warrants a salary towards the higher end of that range.
I am open to discussing the entire compensation package, including benefits ...
Interview Preparation Tips
Practice
Provide evidence &Data
I applied via Referral and was interviewed before Jun 2021. There were 2 interview rounds.
Java, program logic, software engineering
Interview Preparation Tips
- Java
I applied via Recruitment Consulltant and was interviewed before Aug 2021. There were 2 interview rounds.
(1 Question)
- Q1. Java. Spring boot, micro service, hibernate
(1 Question)
- Q1. Salary, technical, company details
Interview Preparation Tips
- Java
- Spring Boot
- Micro service
- Hibernate
- JSP
Chaitanya Bulusu
I applied via Company Website and was interviewed in May 2021. There were 3 interview rounds.
Interview Questionnaire
1 Question
- Q1. .NET basics
I applied via Walk-in and was interviewed before Feb 2021. There were 3 interview rounds.
(7 Questions)
- Q1. Share details of your previous job.
- Q2. Why should we hire you?
- Q3. What are your salary expectations?
- Q4. What is your family background?
- Ans.
I come from a close-knit family that values education, creativity, and support, shaping my personal and professional growth.
Supportive Parents: My parents encouraged my interests in technology from a young age, providing resources for learning programming.
Siblings: I have a younger sister who is passionate about art, and we often collaborate on projects that blend technology and creativity.
Family Traditions: We have a ...
- Q5. What are your strengths and weaknesses?
- Q6. Tell me about yourself.
- Q7. This opportunity is really excited for me
(7 Questions)
- Q1. What are your salary expectations?
- Q2. What is your family background?
- Ans.
I come from a close-knit family that values education, creativity, and support, which has greatly influenced my career path.
Supportive Parents: My parents encouraged my interest in technology from a young age, providing me with resources like books and courses.
Siblings: I have a younger sister who is also in the tech field, and we often collaborate on projects, sharing ideas and learning from each other.
Family Values: ...
- Q3. Share details of your previous job.
- Q4. What are your strengths and weaknesses?
- Q5. Tell me about yourself.
- Q6. Describe any difficult work situation or project that you have handled
- Ans.
Handled a difficult project involving complex data migration and integration
Had to understand the existing data structure and map it to the new system
Dealt with multiple data sources and formats
Ensured data integrity and accuracy throughout the migration process
Collaborated with cross-functional teams to ensure successful integration
Implemented automated testing to validate data migration and integration
Managed project...
- Q7. Hard work and smart work
- Ans. Reaching the building through steps is hard work ,smart work life is smart 6 the uses steps definitely .. reach the destination
Interview Preparation Tips
- Software developer
- Flash Animation
- 3D Character Animation
- Photography
- Photoshop
- Basic
- Logo Design
Cognizant Interview FAQs
Some of the top questions asked at the Cognizant React Developer interview -
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