Chaincode Consulting Senior Node Js Developer Interview Questions and Answers

Q1. Basics of JS and Node JS
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Q2. Questions Related to my current project.
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Q3. Object deep cloning, HTTP methods, Array questions, db indexing, load balancing
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Q4. The interviewer asked me to write some code syntaxes
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Q1. Related to my project, day-to-day activities, team handling questions, difficulties faced, achievements
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Q2. Some technical related to node js, single or multi-thread, why single thread, how single thread.
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Q1. Salary discussion, DOJ
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Q2. All the rounds mentioned above started with self-intro.
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Q1. Explain Virtual DOM, Key Features of React, Hooks in React, create a todo app in react
Ans. 
Virtual DOM is a lightweight copy of the actual DOM, React key features include component-based architecture, declarative syntax, and virtual DOM, React Hooks are functions that let you use state and other React features without writing a class.
• Virtual DOM is a lightweight copy of the actual DOM that React uses to improve performance by updating only the necessary parts of the DOM.

• Key features of React include componen...read more
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Q2. Javascript Questions- Closures,promises,Async/await,setTimeOut, write acode to reverse a string
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Q1. Self Introduction, some situation based questions
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Q2. Basic HR regular questions
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BE AWARE THAT Interview starts at 10 ends at 6 in the evening

this will be 1st round

let arr=[{id:1,x:10},{id:2,y:10}}],let arr2=[{id:1:x10},{id:3,y:20}]
you need to combine both the object merge it into one

2. you will be given sql query to write that is get method

Online Hackathon test was taken.

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
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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
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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.
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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.
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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...

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