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CGI Group React Js Frontend Developer Interview Questions and Answers

Updated 2 Aug 2024

CGI Group React Js Frontend Developer Interview Experiences

1 interview found

Interview experience
4
Good
Difficulty level
Easy
Process Duration
Less than 2 weeks
Result
Not Selected

I applied via Recruitment Consulltant and was interviewed in Jul 2024. There was 1 interview round.

Round 1 - Technical 

(2 Questions)

  • Q1. Basic React question
  • Q2. Few Javascript questions

Interview questions from similar companies

Interview experience
3
Average
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
No response

I applied via Naukri.com and was interviewed in Aug 2024. There were 2 interview rounds.

Round 1 - Coding Test 

Online Hackathon test was taken.

Round 2 - Technical 

(6 Questions)

  • Q1. Tell Me About Yourself.
  • Ans. 

    I am a passionate React Js Frontend Developer with experience in building user-friendly and responsive web applications.

    • Experienced in developing web applications using React Js

    • Proficient in HTML, CSS, and JavaScript

    • Familiar with state management libraries like Redux

    • Strong understanding of responsive design principles

    • Ability to work collaboratively in a team environment

  • Answered by AI
  • Q2. Tell me about your roles and responsibilities in your current project.
  • Ans. 

    I am responsible for developing and maintaining the frontend of the project using React Js.

    • Developing user-friendly interfaces using React Js

    • Implementing responsive design and ensuring cross-browser compatibility

    • Collaborating with backend developers to integrate frontend with backend services

    • Optimizing application performance and troubleshooting issues

    • Participating in code reviews and providing feedback to team members

  • Answered by AI
  • Q3. How we implement SSR in React.
  • Ans. 

    SSR in React is implemented using server-side rendering to pre-render React components on the server before sending them to the client.

    • Use libraries like Next.js or Gatsby to implement SSR in React.

    • Configure server to render React components on the server side.

    • Optimize server-side rendering for performance by caching rendered components.

  • Answered by AI
  • Q4. How can we change our project in production mode from development mode.
  • Ans. 

    To change a React project from development mode to production mode, you need to build the project using the 'npm run build' command.

    • Run 'npm run build' command in the terminal to create a production build of the project.

    • This command will generate a 'build' folder with optimized and minified files for production.

    • You can then deploy the contents of the 'build' folder to a web server for production use.

  • Answered by AI
  • Q5. What is lazy loading and how we can implement in our project.
  • Ans. 

    Lazy loading is a technique used to defer loading non-essential resources until they are needed.

    • Lazy loading helps improve performance by only loading resources when they are required.

    • In React, lazy loading can be implemented using React.lazy() and Suspense components.

    • Example: const MyComponent = React.lazy(() => import('./MyComponent'));

    • Example: Loading...

  • }>

Answered by AI
  • Q6. What is react routing and how it is different from other conventional routing methods.
  • Ans. 

    React routing is a way to handle navigation in a React application by defining routes and rendering components based on the URL.

    • React routing allows for declarative routing, where routes are defined using JSX elements.

    • It enables dynamic routing based on the URL, allowing for different components to be rendered based on the route.

    • React Router is a popular library for handling routing in React applications.

    • Unlike convent...

  • Answered by AI

    Interview Preparation Tips

    Interview preparation tips for other job seekers - Depends on interviewers skill set.

    Skills evaluated in this interview

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

    (2 Questions)

    • Q1. What is prop drilling
    • Ans. 

      Prop drilling is the process of passing props down multiple levels of nested components in React.

      • Prop drilling occurs when a prop needs to be passed through multiple levels of components that do not need the prop themselves.

      • It can lead to unnecessary passing of props through intermediate components, making the code harder to maintain.

      • To avoid prop drilling, you can use Context API, Redux, or React's useContext and useR...

    • Answered by AI
    • Q2. What is hoisting
    • Ans. 

      Hoisting is a JavaScript mechanism where variable and function declarations are moved to the top of their containing scope during the compilation phase.

      • Variable declarations are hoisted to the top of their scope, but not their assignments.

      • Function declarations are fully hoisted, meaning they can be called before they are declared.

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

    • Answered by AI
    Round 2 - Technical 

    (1 Question)

    • Q1. Explain useContext hook
    • Ans. 

      useContext hook allows components to access data from a context without passing props down manually

      • useContext hook is used to consume a context created by React.createContext

      • It takes the context object as an argument and returns the current context value for that context

      • It allows components to subscribe to context changes and re-render when the context value changes

    • Answered by AI

    Skills evaluated in this interview

    Interview experience
    5
    Excellent
    Difficulty level
    Easy
    Process Duration
    Less than 2 weeks
    Result
    Selected Selected

    I applied via Naukri.com and was interviewed before Oct 2023. There were 4 interview rounds.

    Round 1 - Coding Test 

    Online coding round which included question from React and js

    Round 2 - Technical 

    (2 Questions)

    • Q1. Common questions from js
    • Q2. Coding to do in react
    Round 3 - Technical 

    (2 Questions)

    • Q1. Managerial questions
    • Q2. Questions based on resume
    Round 4 - HR 

    (1 Question)

    • Q1. Salary discussion
    Interview experience
    5
    Excellent
    Difficulty level
    Moderate
    Process Duration
    Less than 2 weeks
    Result
    Selected Selected

    I applied via Walk-in and was interviewed in Mar 2024. There were 2 interview rounds.

    Round 1 - HR 

    (2 Questions)

    • Q1. Tell be about yourself
    • Q2. Skills questions
    Round 2 - Technical 

    (1 Question)

    • Q1. Online Quiz in My Skills
    Interview experience
    3
    Average
    Difficulty level
    -
    Process Duration
    -
    Result
    -
    Round 1 - HR 

    (1 Question)

    • Q1. Tell me about your self
    Round 2 - Coding Test 

    What is react , feature, axios, API

    Round 3 - Coding Test 

    Redux Redux toolkit Redux thunk

    Interview Preparation Tips

    Interview preparation tips for other job seekers - Fhnvhfvh
    Interview experience
    4
    Good
    Difficulty level
    Easy
    Process Duration
    -
    Result
    No response

    I was interviewed in May 2024.

    Round 1 - Technical 

    (6 Questions)

    • Q1. What is Redux ? How we are using it in real time
    • Ans. 

      Redux is a predictable state container for JavaScript apps.

      • Redux is a state management library for JavaScript applications.

      • It helps in managing the state of the application in a predictable way.

      • Redux stores the entire state of the application in a single immutable object.

      • Actions are dispatched to update the state, and reducers specify how the state changes in response to actions.

      • Redux is commonly used with React to man...

    • Answered by AI
    • Q2. What is Virtual Dom ? and its work in reactjs
    • Ans. 

      Virtual DOM is a lightweight copy of the actual DOM in memory, used by React to improve performance by minimizing actual DOM manipulations.

      • Virtual DOM is a concept where a lightweight copy of the actual DOM is kept in memory.

      • React uses Virtual DOM to improve performance by minimizing actual DOM manipulations.

      • When state changes in a React component, a new Virtual DOM representation is created and compared with the previ...

    • Answered by AI
    • Q3. What is difference in usememo and react.memo
    • Ans. 

      useMemo is used for memoizing expensive calculations, while React.memo is used for memoizing functional components.

      • useMemo is a hook used to memoize expensive calculations and only recompute the value when the dependencies change.

      • React.memo is a higher order component used to memoize functional components and prevent unnecessary re-renders.

      • useMemo is typically used for optimizing performance by caching values, while Re...

    • Answered by AI
    • Q4. Difference between map and forEach ?
    • Ans. 

      map returns a new array with modified elements, forEach does not return anything and just iterates over the array.

      • map returns a new array with the results of calling a provided function on every element in the array.

      • forEach executes a provided function once for each array element without returning anything.

      • Example: const numbers = [1, 2, 3]; const doubled = numbers.map(num => num * 2); // doubled will be [2, 4, 6]; num...

    • Answered by AI
    • Q5. Find Duplicacy Array
    • Ans. 

      Find duplicates in an array of strings

      • Iterate through the array and use a hash map to keep track of the frequency of each element

      • If an element is already in the hash map, it is a duplicate

    • Answered by AI
    • Q6. What is Currying function ?
    • Ans. 

      Currying is a technique in functional programming where a function with multiple arguments is transformed into a sequence of functions, each taking a single argument.

      • Currying helps in creating reusable functions and improving code readability.

      • It allows partial application of functions, where some arguments are fixed and others are left to be provided later.

      • Example: const add = (a) => (b) => a + b; add(2)(3) will return

    • Answered by AI

    Skills evaluated in this interview

    Interview experience
    5
    Excellent
    Difficulty level
    Moderate
    Process Duration
    Less than 2 weeks
    Result
    Selected Selected

    I was interviewed in Oct 2024.

    Round 1 - One-on-one 

    (2 Questions)

    • Q1. What is React Query, how is it different from Redux
    • Ans. 

      React Query is a library for managing server state in React applications, while Redux is a state management library for managing client-side state.

      • React Query is specifically designed for managing server state, making it easier to fetch, cache, and update data from APIs.

      • Redux is a more general-purpose state management library that can be used for managing client-side state in a predictable way.

      • React Query provides buil...

    • Answered by AI
    • Q2. Difference between interface and type
    • Ans. 

      Interface is for defining object shapes and types, while type is for creating aliases for existing types.

      • Interface is used for defining the structure of an object in TypeScript.

      • Type is used to create aliases for existing types, making code more readable and reusable.

      • Interfaces can be extended or implemented, while types can be used to create union types or intersection types.

      • Interfaces are open for extension, while typ

    • Answered by AI

    Skills evaluated in this interview

    Interview experience
    3
    Average
    Difficulty level
    Moderate
    Process Duration
    Less than 2 weeks
    Result
    No response

    I applied via Naukri.com and was interviewed in Sep 2023. There were 2 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 - Technical 

    (3 Questions)

    • Q1. Write HOC Component ?
    • Ans. 

      A Higher Order Component (HOC) is a function that takes a component and returns a new component with additional functionality.

      • HOCs are used to share code between components, add additional features, or modify behavior.

      • They are commonly used for tasks like authentication, logging, and data fetching.

      • Example: const withAuth = (WrappedComponent) => { return class extends React.Component { render() { return

    • Answered by AI
    • Q2. Write custom hook ?
    • Ans. 

      A custom hook is a reusable function that allows you to extract component logic into a separate function.

      • Custom hooks start with 'use' keyword.

      • Custom hooks can call other hooks if needed.

      • Custom hooks can be shared and reused across multiple components.

    • Answered by AI
    • Q3. Write closure function
    • Ans. 

      A closure function is a function that has access to its own scope, as well as the outer scope in which it was defined.

      • A closure function can access variables from its outer scope even after the outer function has finished executing.

      • Closures are commonly used to create private variables in JavaScript.

      • Example: function outerFunction() { let outerVar = 'I am outer'; return function innerFunction() { console.log(outerVar);...

    • Answered by AI

    Interview Preparation Tips

    Topics to prepare for Cognizant React Js Frontend Developer interview:
    • React.Js
    Interview experience
    5
    Excellent
    Difficulty level
    Moderate
    Process Duration
    2-4 weeks
    Result
    Selected Selected

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

    Round 1 - Technical 

    (7 Questions)

    • Q1. What is the mechanism of virtual DOM?
    • Ans. 

      Virtual DOM is a lightweight copy of the actual DOM that React uses to improve performance by minimizing direct manipulation of the actual DOM.

      • Virtual DOM is a representation of the actual DOM in the form of a lightweight copy.

      • When changes are made to the virtual DOM, React compares it with the actual DOM to identify the minimal number of changes needed.

      • This process helps in optimizing performance by reducing direct ma...

    • Answered by AI
    • Q2. What is reconciliation in react?
    • Ans. 

      Reconciliation in React is the process of updating the DOM to match the virtual DOM.

      • Reconciliation is the algorithm that React uses to update the UI efficiently.

      • It compares the virtual DOM with the previous virtual DOM and only updates the necessary components.

      • Reconciliation helps in improving performance by minimizing DOM manipulations.

      • Key prop is important for reconciliation to identify which items have changed, adde...

    • Answered by AI
    • Q3. What are closures?
    • Ans. 

      Closures are functions that have access to variables from their outer scope even after the outer function has finished executing.

      • Closures allow functions to access variables from their parent function's scope

      • They maintain a reference to the variables they need, even after the parent function has finished executing

      • Closures are commonly used in event handlers and callbacks

    • Answered by AI
    • Q4. What is hoisting?
    • Ans. 

      Hoisting is a JavaScript mechanism where variable and function declarations are moved to the top of their containing scope during compilation.

      • Hoisting applies to both variable and function declarations.

      • Variable declarations are hoisted to the top of their scope but not their assignments.

      • Function declarations are fully hoisted, meaning they can be called before they are declared.

    • Answered by AI
    • Q5. What are es6 features ? and code output
    • Ans. 

      ES6 features are modern JavaScript syntax enhancements that make code more concise and readable.

      • Arrow functions for more concise syntax: const add = (a, b) => a + b;

      • Let and const for block-scoped variables: let x = 5; const y = 10;

      • Template literals for string interpolation: const name = 'Alice'; console.log(`Hello, ${name}!`);

      • Destructuring assignment for easily extracting values from objects or arrays: const { firstNam...

    • Answered by AI
    • Q6. What is react fiber?
    • Ans. 

      React Fiber is a complete rewrite of React's core algorithm for rendering UI components.

      • React Fiber is a reimplementation of the React core algorithm.

      • It allows for incremental rendering, prioritizing updates based on their priority level.

      • Fiber reconciles the virtual DOM tree in a more efficient and flexible way.

      • It enables features like error boundaries, async rendering, and more.

      • Fiber was introduced in React version 16

    • Answered by AI
    • Q7. How do you implement dark mode in an application?
    • Ans. 

      Implementing dark mode in an application involves changing the color scheme to darker tones for better visibility in low light environments.

      • Use CSS variables to define color schemes for light and dark modes

      • Toggle between light and dark mode using a state variable in React

      • Apply the appropriate color scheme based on the selected mode

      • Allow users to switch between light and dark mode using a toggle button

    • Answered by AI
    Round 2 - Behavioral 

    (2 Questions)

    • Q1. What is agile ? What ceremonies does your project follow?
    • Q2. What are some bottlenecks you faced in your project?
    Round 3 - HR 

    (1 Question)

    • Q1. Salary discussion and basic negotiation questions

    Interview Preparation Tips

    Interview preparation tips for other job seekers - Stick to basis.

    Skills evaluated in this interview

    CGI Group Interview FAQs

    How many rounds are there in CGI Group React Js Frontend Developer interview?
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    ₹4.5 L/yr - ₹8 L/yr
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