Capgemini Engineering React Developer Interview Questions, Process, and Tips

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

Javascript questions about closure,prototype, strings array problem solving

Html css react coding with tricky and real scenarios in project

Q1. Managerial round with basic introduction and future goals
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Q1. Discussion about my previous project
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Q2. Question on html, css, javascript & react
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Q3. Explain about promises
Ans. 
Promises are objects representing the eventual completion or failure of an asynchronous operation.
• Promises are used to handle asynchronous operations in JavaScript.

• They 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.

• Example: const myPromise = new Promise((resolve, reject) => { ... });
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Q4. Use state, context api
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Q5. Box modelling in css, css pre processors
Ans. 
Box model in CSS refers to the way elements are rendered in a web page. CSS preprocessors like SASS or LESS help streamline CSS development.
• Box model in CSS includes content, padding, border, and margin.

• CSS preprocessors like SASS or LESS allow for variables, nesting, and mixins to be used in CSS.

• Example: box-sizing: border-box; in CSS changes the box model to include padding and border in the element's total width and
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Q1. Reverse an array using Java 8
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Using Java 8, reverse an array of strings
• Use Arrays.stream() to convert the array to a stream

• Use Collections.reverse() to reverse the stream

• Use Collectors.toList() to convert the stream back to a list
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Q1. Code a controller class , service class, entity and repository
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Code a controller, service, entity, and repository classes for a software application.
• Create a controller class to handle incoming requests and interact with the service layer.

• Develop a service class to implement business logic and interact with the repository.

• Define an entity class to represent data in the application.

• Implement a repository class to handle database operations for the entity.
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Q2. Basic questions about steams
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Coding test was around 2 hrs

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...read more
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Q2. What is docker container runtime
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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.
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Q1. They have asked Backed related question for a ui role.
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Q2. Mostly project related question
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Worst set of questions

Advanced DSA for entry level role

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.
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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...read more
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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
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Q4. Difference between traditional function and arrow function
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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...read more
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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
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Q6. Program to find frequency of letters in a string
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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
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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.
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