Step2gen Technologies Full Stack Developer Interview Questions and Answers

Q1. What is useState in React.js
Ans. 
useState is a React hook that allows functional components to manage state.
• useState is imported from React: `import React, { useState } from 'react';`

• It initializes state in functional components: `const [count, setCount] = useState(0);`

• The first element is the current state value, and the second is a function to update it.

• State updates are asynchronous and can be batched for performance.

• Example of updating state: `set...read more
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Q2. Difference between useState and useEffect
Ans. 
useState manages state in functional components; useEffect handles side effects like data fetching and subscriptions.
• useState is a Hook that allows you to add state to functional components.

• Example: const [count, setCount] = useState(0);

• useEffect is a Hook that lets you perform side effects in function components.

• Example: useEffect(() => { document.title = `Count: ${count}`; }, [count]);

• useState is synchronous and u...read more
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Q1. The Database performance is becoming a bottleneck and the team needs to horizontally scale the database. Which design approach should they use to scale the database efficiently?
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Q2. The app needs to send a beyond time notification to user about driver status. The status are asked, arrived, cancelled or completed. Each notification must be processed asynchronously to avoid blocking oth...read more
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Q1. Can you introduce yourself?
Ans. 
Experienced Full Stack Developer with expertise in front-end and back-end technologies.
• Experienced in HTML, CSS, JavaScript for front-end development

• Proficient in Node.js, Express, MongoDB for back-end development

• Familiar with React, Angular for building interactive web applications
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Q2. What is graphQL?, What is REST API? and which is better graphQL or REST API?
Ans. 
GraphQL is a query language for APIs and a runtime for executing those queries. REST API is a set of rules for building web services. Both have their own advantages.
• GraphQL allows clients to request only the data they need, reducing over-fetching and under-fetching.

• REST API follows a more rigid structure and is easier to understand for beginners.

• GraphQL is more efficient for complex queries involving multiple resources...read more
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I was asked to discuss the system design of Google Meet, with a primary focus on video processing and WebRTC.

A graph question regarding LC 1334.

Q1. Can you provide an introduction and a summary of your past experiences, as well as your motivations for wanting to join this company?
Ans. 
Experienced Full Stack Developer with a passion for creating innovative solutions and a strong desire to contribute to a dynamic team.
• Over 5 years of experience in full stack development, working on various projects from concept to deployment.

• Proficient in front-end technologies such as HTML, CSS, JavaScript, and React.

• Skilled in back-end technologies including Node.js, Express, and MongoDB.

• Motivated by the opportunity...read more
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Basic Aptitude Test

Q1. Basic Javascript Question from freecodecamp
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Q2. Asked about the Tech Stack you are Baised towards
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It was good and to the point

Q1. Just about the previous job
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Q2. Projects and stuff about the previous job
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Q1. Explain in Rest API in web application?
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Q2. Explain in API in web application?
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Q1. Tell me about yourself and past internship
Ans. 
I am a Full Stack Developer with experience in web development and past internship at a tech startup.
• Completed internship at XYZ Tech Startup, where I worked on developing and maintaining web applications

• Proficient in front-end technologies like HTML, CSS, JavaScript, and React

• Skilled in back-end technologies like Node.js, Express, and MongoDB

• Familiar with version control systems like Git and project management tools l
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Q2. Tell about your B.tech project
Ans. 
Developed a web application for online book rental system
• Used HTML, CSS, JavaScript for front-end development

• Implemented PHP and MySQL for back-end functionality

• Included features like user registration, book search, and rental management
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