Future Focus Infotech Mern Full Stack Developer Interview Questions and Answers

Q1. React hooks, nodejs routing, metadata, aws deployment process, microservices, dom, event loop
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Q1. Longest common substring in an array
Ans. 
Find the longest common substring in an array of strings.
• Iterate through each string in the array and compare with all other strings to find common substrings.

• Keep track of the longest common substring found so far.

• Return the longest common substring at the end.
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Q1. Explain Virtual DOM in React
Ans. 
Virtual DOM in React is a lightweight copy of the actual DOM, used for efficient updates and rendering.
• Virtual DOM is a concept where a lightweight copy of the actual DOM is created in memory.

• When changes are made to the UI, React compares the Virtual DOM with the actual DOM to identify the differences.

• React then updates only the necessary parts of the actual DOM, minimizing the number of DOM manipulations for better p...read more
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Q2. How to optimise a React application
Ans. 
Optimising a React application involves code splitting, lazy loading, using memoization, reducing unnecessary re-renders, and optimizing network requests.
• Implement code splitting to load only necessary code for each route or component.

• Use lazy loading to load components only when they are needed, reducing initial load time.

• Utilize memoization techniques like useMemo and useCallback to prevent unnecessary re-renders.

• Avo...read more
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Quantitive Aptitude, General programming,oops

GK, Quantitative Aptitude

C# Fundamentals , ADO.NET,LINQ

Q1. Why there are so frequent change.
Ans. 
Frequent changes in technology are driven by advancements, market demands, and user feedback.
• Advancements in technology lead to new tools and frameworks being developed.

• Market demands require companies to adapt quickly to stay competitive.

• User feedback helps improve products and services, leading to updates and changes.

• Examples: Introduction of new programming languages like Swift, shift towards cloud computing, update...read more
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Q2. Please tell me about your understanding with roll
Ans. 
Roll is a term used in web development to describe the process of deploying code changes to a live server.
• Rolling back changes means reverting to a previous version of the code.

• Rolling forward means applying new changes to the live server.

• Rolling deployments involve gradually updating servers in a controlled manner to minimize downtime.

• Automated rollbacks can be triggered in case of errors or issues during deployment.
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Q1. Rest api standards
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Q2. Client server communication
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Q3. Framework related questions
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Q1. Tell me about yourself
Ans. 
I am a passionate Full Stack Developer with experience in building web applications using various technologies.
• Experienced in front-end technologies like HTML, CSS, JavaScript, and frameworks like React and Angular

• Proficient in back-end technologies like Node.js, Express, and databases like MongoDB and SQL

• Familiar with version control systems like Git and deployment tools like Heroku
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Q2. Do you have any quetion for me ?
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Programming language, c, html, css, javascript, php, angular,

Topics consist of profit-loss, probability, permutation combination etc.

Coding question related to topics array and strings.

Q1. Questions related to Java, oops, DBMS and tech-stack are mention in the resume
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Q2. Role of java in backend, explain polymorphism in oops, reverse string.
Ans. 
Java is a popular backend language, polymorphism allows objects to be treated as instances of their parent class, reverse string by iterating through characters.
• Java is commonly used in backend development for its robustness and scalability.

• Polymorphism in OOP allows objects to be treated as instances of their parent class, enabling flexibility and reusability.

• To reverse a string, iterate through the characters from th...read more
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Q1. It also consists of technical questions, future goals, project discussion mentioned in the resume and related tech stack, future goals, etc.
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