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Capgemini Engineering React Developer Interview Questions, Process, and Tips

Updated 21 Apr 2021

Capgemini Engineering React Developer Interview Experiences

1 interview found

I applied via Naukri.com and was interviewed in Mar 2021. There was 1 interview round.

Interview Questionnaire 

16 Questions

  • Q1. Difference between Let, Const and Var. Write code and explain.
  • Ans. 

    Let, Const, and Var are used to declare variables in JavaScript with different scoping and reassignment abilities.

    • Var has function scope and can be redeclared and reassigned.

    • Let has block scope and can be reassigned but not redeclared.

    • Const has block scope and cannot be reassigned or redeclared.

  • Answered by AI
  • Q2. What are state and props. Difference.
  • Ans. 

    State and props are two important concepts in React. State represents the internal data of a component, while props are used to pass data from a parent component to a child component.

    • State is mutable and can be changed within a component.

    • Props are read-only and cannot be modified within a component.

    • State is used to manage component-specific data, while props are used for inter-component communication.

    • State is initializ...

  • Answered by AI
  • Q3. Difference between Promise and Async-Await?
  • Ans. 

    Promise is a callback function that returns a value in the future. Async-Await is a syntax that simplifies working with Promises.

    • Promises are used to handle asynchronous operations and avoid callback hell.

    • Async-Await is a syntax that allows writing asynchronous code that looks like synchronous code.

    • Async-Await is built on top of Promises and uses the same underlying mechanism.

    • Async-Await can only be used within an asyn...

  • Answered by AI
  • Q4. What are Closures in JS?
  • Ans. 

    Closures are functions that have access to variables in their outer scope, even after the outer function has returned.

    • Closures are created when a function is defined inside another function.

    • The inner function has access to the outer function's variables and parameters.

    • Closures can be used to create private variables and methods.

    • Closures can also be used to create functions with pre-set arguments.

  • Answered by AI
  • Q5. What is Hoisting in JS?
  • Ans. 

    Hoisting is a JavaScript behavior where variable and function declarations are moved to the top of their scope.

    • Hoisting applies to both variable and function declarations.

    • Variable declarations are hoisted but not their initializations.

    • Function declarations are fully hoisted, including their definitions.

    • Hoisting can lead to unexpected behavior if not understood properly.

  • Answered by AI
  • Q6. How does Event Loop works? What are Event Queue and Event Stack?
  • Ans. 

    Event Loop is a mechanism that allows JavaScript to handle asynchronous operations.

    • Event Loop is a continuous process that checks the Event Queue and moves events to the Event Stack.

    • Event Queue holds all the events that are waiting to be processed.

    • Event Stack holds the events that are currently being processed.

    • When the Event Stack is empty, the Event Loop checks the Event Queue for new events.

    • JavaScript uses Event Loop...

  • Answered by AI
  • Q7. What are ES6 Features? Important Question everywhere
  • Q8. Difference between Local and Session Storage
  • Ans. 

    Local Storage is persistent storage that remains even after the browser is closed, while Session Storage is temporary and is cleared when the browser is closed.

    • Local Storage has no expiration date, while Session Storage is cleared when the session ends

    • Local Storage can store larger amounts of data compared to Session Storage

    • Local Storage is accessible across different browser tabs and windows, while Session Storage is ...

  • Answered by AI
  • Q9. Explain Redux workflow.
  • Ans. 

    Redux is a state management library for JavaScript applications, providing a predictable and centralized workflow.

    • Redux follows a unidirectional data flow pattern.

    • The application state is stored in a single JavaScript object called the store.

    • Actions are dispatched to describe state changes.

    • Reducers are pure functions that specify how the state should change based on the dispatched actions.

    • Selectors are used to extract ...

  • Answered by AI
  • Q10. How can you optimize a React App?
  • Ans. 

    Optimizing a React app involves reducing bundle size, using lazy loading, and optimizing rendering performance.

    • Reduce bundle size by code splitting and using dynamic imports

    • Use lazy loading to load components only when needed

    • Optimize rendering performance by using shouldComponentUpdate and PureComponent

    • Use React.memo to memoize functional components

    • Avoid unnecessary re-renders by using useMemo and useCallback

    • Use perfor...

  • Answered by AI
  • Q11. What are Hooks in React? Name the ones you have used in your project.
  • Ans. 

    Hooks are a feature introduced in React 16.8 that allow developers to use state and other React features in functional components.

    • useState() - for managing state in functional components

    • useEffect() - for performing side effects in functional components

    • useContext() - for accessing context in functional components

    • useReducer() - for managing complex state and actions in functional components

    • useCallback() - for memoizing f...

  • Answered by AI
  • Q12. Explain your current React project that you are working on.
  • Q13. What are Higher Order Functions and Higher Order Components. Give examples.
  • Ans. 

    Higher Order Functions are functions that take other functions as arguments or return functions as their results.

    • Higher Order Functions can be used to create reusable code by abstracting common functionality into a separate function.

    • They can also be used to implement functional programming concepts like currying and composition.

    • Example: Array.prototype.map() is a higher order function that takes a callback function as ...

  • Answered by AI
  • Q14. How many teams and members do you have in your current project? What is sprint? Which SDLC methodology do you follow in your current company's project?
  • Q15. What is Context API?
  • Ans. 

    Context API is a feature in React that allows data to be passed down the component tree without manually passing props at each level.

    • Context API provides a way to share data between components without the need for prop drilling.

    • It consists of two main components: Provider and Consumer.

    • The Provider component allows data to be provided and accessed by any component within its subtree.

    • The Consumer component allows compone...

  • Answered by AI
  • Q16. Explain Life Cycle in Class Components. Important Question.

Interview Preparation Tips

Interview preparation tips for other job seekers - This was First technical round of interview with Altran, India. Interviewer was nice and asked basic questions related to JavaScript and React. It is important to know working of JavaScript and JS Engine. It lasted for 30 minutes and I cleared the round. Next was a technical round with more questions.

Skills evaluated in this interview

Interview questions from similar companies

Interview experience
4
Good
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
-

I applied via Naukri.com and was interviewed in Jan 2024. There were 3 interview rounds.

Round 1 - Technical 

(2 Questions)

  • Q1. Basic Javascript and React JS interview Questions
  • Q2. Basic Typescript Interview Question
Round 2 - Technical 

(1 Question)

  • Q1. Questions Based on Project
Round 3 - Client Interview 

(1 Question)

  • Q1. Advanced react Interview Questions

Interview Preparation Tips

Topics to prepare for CGI Group React Developer interview:
  • Hooks
  • Redux
  • Routing
  • React.Js
  • Javascript
Interview experience
3
Average
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
Not Selected

I applied via Naukri.com and was interviewed in Jan 2024. There was 1 interview round.

Round 1 - Aptitude Test 

An aptitutde test 20 questions, 2 coding and 2 output based

Interview Preparation Tips

Interview preparation tips for other job seekers - practice aptitude questions and Basic 2d array questions
Interview experience
5
Excellent
Difficulty level
Hard
Process Duration
Less than 2 weeks
Result
Selected Selected

I applied via Recruitment Consulltant and was interviewed before Aug 2022. There were 4 interview rounds.

Round 1 - Resume Shortlist 
Pro Tip by AmbitionBox:
Keep your resume crisp and to the point. A recruiter looks at your resume for an average of 6 seconds, make sure to leave the best impression.
View all tips
Round 2 - Coding Test 

Javascript questions about closure,prototype, strings array problem solving

Round 3 - Coding Test 

Html css react coding with tricky and real scenarios in project

Round 4 - One-on-one 

(1 Question)

  • Q1. Managerial round with basic introduction and future goals
Interview experience
3
Average
Difficulty level
-
Process Duration
-
Result
-
Round 1 - Coding Test 

Coding test was around 2 hrs

Round 2 - One-on-one 

(2 Questions)

  • Q1. What is kubernets
  • Ans. 

    Kubernetes is an open-source container orchestration platform for automating deployment, scaling, and management of containerized applications.

    • Kubernetes helps in automating the deployment, scaling, and management of containerized applications.

    • It allows for easy scaling of applications by adding or removing containers based on demand.

    • Kubernetes provides features like load balancing, self-healing, and rolling updates fo...

  • Answered by AI
  • Q2. What is docker container runtime
  • Ans. 

    Docker container runtime is the engine that executes containers, managing their lifecycle and resources.

    • Docker container runtime is responsible for running and managing Docker containers.

    • It provides an isolated environment for applications to run without affecting the host system.

    • Popular container runtimes include Docker Engine, containerd, and CRI-O.

  • Answered by AI

Skills evaluated in this interview

Interview experience
5
Excellent
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
No response

I applied via Approached by Company and was interviewed in Apr 2024. There were 3 interview rounds.

Round 1 - Technical 

(1 Question)

  • Q1. Object , array , ES6, React basics
Round 2 - Technical 

(2 Questions)

  • Q1. Advance Javascript questions
  • Q2. React application with custom hooks
  • Ans. 

    Custom hooks in React allow for reusable logic across components.

    • Custom hooks are functions that use React hooks internally and can be reused across multiple components.

    • They can encapsulate complex logic and state management, making components more modular and easier to maintain.

    • Example: A custom hook for fetching data from an API and handling loading and error states can be used in multiple components.

    • Example: A custo...

  • Answered by AI
Round 3 - One-on-one 

(1 Question)

  • Q1. Roles & Responsibilites

Skills evaluated in this interview

Interview experience
5
Excellent
Difficulty level
-
Process Duration
-
Result
-
Round 1 - Technical 

(2 Questions)

  • Q1. They have asked Backed related question for a ui role.
  • Q2. Mostly project related question
Interview experience
1
Bad
Difficulty level
Hard
Process Duration
2-4 weeks
Result
No response

I applied via Job Portal and was interviewed in Dec 2024. There were 2 interview rounds.

Round 1 - Aptitude Test 

Worst set of questions

Round 2 - Coding Test 

Advanced DSA for entry level role

Interview Preparation Tips

Interview preparation tips for other job seekers - Don't join this company
Interview experience
5
Excellent
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
Not Selected

I applied via Referral and was interviewed in Feb 2024. There was 1 interview round.

Round 1 - Technical 

(7 Questions)

  • Q1. Types of Promises
  • Ans. 

    Promises in JavaScript are objects representing the eventual completion or failure of an asynchronous operation.

    • Promises can be in one of three states: pending, fulfilled, or rejected.

    • Promises can be chained using .then() to handle success and .catch() to handle errors.

    • Promises can be created using the Promise constructor or by using async/await syntax.

  • Answered by AI
  • Q2. Difference between useState and useEffect
  • Ans. 

    useState is used to manage state in functional components, while useEffect is used to perform side effects in functional components.

    • useState is used to declare state variables in functional components.

    • useEffect is used to perform side effects in functional components, such as data fetching, subscriptions, or manually changing the DOM.

    • useState does not trigger re-renders, while useEffect can be used to trigger re-render...

  • Answered by AI
  • Q3. What is Callback hell
  • Ans. 

    Callback hell is a situation where multiple nested callbacks make the code difficult to read and maintain.

    • Occurs when multiple asynchronous operations are nested within each other

    • Leads to deeply nested code structure which is hard to understand

    • Can be avoided by using Promises, async/await, or modularizing code

  • Answered by AI
  • Q4. Difference between traditional function and arrow function
  • Ans. 

    Traditional functions are defined using the function keyword, while arrow functions are defined using a concise syntax with =>.

    • Traditional functions are hoisted, while arrow functions are not.

    • Arrow functions do not have their own 'this' keyword, they inherit it from the parent scope.

    • Arrow functions are more concise and easier to read compared to traditional functions.

    • Traditional functions are better for methods in obje...

  • Answered by AI
  • Q5. Usecase to create counter in react
  • Ans. 

    Creating a counter in React to increment and decrement a value.

    • Create a state variable to store the count value

    • Use setState to update the count value

    • Render the count value in the component

    • Add buttons to increment and decrement the count value

  • Answered by AI
  • Q6. Program to find frequency of letters in a string
  • Ans. 

    Program to find frequency of letters in a string

    • Create an object to store the frequency of each letter

    • Loop through the string and increment the count of each letter in the object

    • Convert the object into an array of strings with letter and frequency pairs

  • Answered by AI
  • Q7. Program to find if substring is present in a given string without using predefined functions
  • Ans. 

    Iterate through the given string to check if the substring is present.

    • Iterate through the given string and check if each character matches the first character of the substring.

    • If a match is found, check the subsequent characters to see if they form the substring.

    • Return true if the entire substring is found within the given string, otherwise return false.

  • Answered by AI

Skills evaluated in this interview

Interview experience
4
Good
Difficulty level
-
Process Duration
-
Result
-
Round 1 - Technical 

(2 Questions)

  • Q1. Array qs reverse
  • Q2. Question about angular and react

Capgemini Engineering Interview FAQs

What are the top questions asked in Capgemini Engineering React Developer interview?

Some of the top questions asked at the Capgemini Engineering React Developer interview -

  1. What are Hooks in React? Name the ones you have used in your proje...read more
  2. What are Higher Order Functions and Higher Order Components. Give exampl...read more
  3. How does Event Loop works? What are Event Queue and Event Sta...read more

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