Tech Mahindra Mern Full Stack Developer Interview Questions and Answers

Q1. What is virtual DOM?
Ans. 
Virtual DOM is a lightweight copy of the actual DOM that allows for efficient updates and rendering in web applications.
• Virtual DOM is a concept used in frameworks like React to improve performance by minimizing direct manipulation of the actual DOM.

• When changes are made to the virtual DOM, a comparison is done with the actual DOM to identify the minimal number of updates needed.

• This approach reduces the number of DOM ...read more
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Q2. What is foriegn Key SQL?
Ans. 
Foreign key in SQL is a field in a table that is a primary key in another table, establishing a relationship between the two tables.
• A foreign key constraint ensures referential integrity between two related tables.

• It helps maintain consistency and avoid orphan records.

• Example: In a database with tables 'orders' and 'customers', the 'customer_id' in 'orders' table can be a foreign key referencing the 'id' column in 'cus
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Q1. What is props
Ans. 
Props are read-only properties that are passed from a parent component to a child component in React.
• Props allow data to be passed down the component tree.

• Props are immutable and cannot be changed by the child component.

• Props are accessed in the child component using this.props.
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Q2. What is Good feedback you ever got in during you development period.
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Q1. What is error handling middleware?
Ans. 
Error handling middleware is a function that processes errors in an Express application.
• Error handling middleware is defined with four parameters: err, req, res, and next.

• It is used to catch errors that occur during the execution of route handlers or other middleware functions.

• It is typically defined at the end of the middleware chain with app.use() and has a signature like (err, req, res, next) => {...}.

• Example: app.u...read more
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Q1. Which one you choose mongo vs mysql and why
Ans. 
I would choose MongoDB for its flexibility and scalability in handling unstructured data.
• MongoDB is a NoSQL database, making it easier to work with unstructured data compared to MySQL which is a relational database.

• MongoDB is highly scalable and can handle large amounts of data and high traffic loads.

• MongoDB is a good choice for applications that require frequent updates and real-time analytics.

• MySQL is a better choice...read more
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Q1. Do you have an internship opportunity for a Full-stack Developer(Fresher)?
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Q1. Is the internship for a full-stack developer paid?
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Q1. How many years is the internship for a full-stack Developer?
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Q1. Javascript questions were mainly there like closures , currying Objects and promises , then they started with React
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Q2. In react they asked about hooks, difference between props and state, version , useMemo , axios working , microservices
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Q1. Why do u want to join us , u already holding an offer
Ans. 
I am drawn to your company's innovative projects and collaborative work environment.
• I am impressed by the cutting-edge technologies and projects your company is working on.

• I value the opportunity to work in a collaborative and supportive team environment.

• I believe that joining your company will provide me with the chance to further develop my skills and contribute meaningfully to impactful projects.
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Q2. How do u prioritize your task
Ans. 
I prioritize tasks based on deadlines, importance, and dependencies.
• I create a list of all tasks and categorize them based on deadlines.

• I identify tasks that are critical to the project's success and prioritize them accordingly.

• I consider dependencies between tasks and prioritize those that are dependent on others being completed first.

• I regularly reassess priorities and adjust as needed based on changing circumstances...read more
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Q1. React common questions
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Q2. Spring boot and microservices questions
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Q3. Sql questions like second highest salary
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Q4. Java streams interview questions like second highest
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Good morning sir have a you sir my name is hemant Ramchandra narkhede

Java script simple frame

Q1. What are the different data types present in javascript?
Ans. 
JavaScript has several data types including string, number, boolean, object, function, undefined, and null.
• String: 'hello', '123'

• Number: 123, 3.14

• Boolean: true, false

• Object: { key: 'value' }

• Function: function() { }

• Undefined: undefined

• Null: null
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Q2. Difference between var and let keyword in javascript.
Ans. 
var is function-scoped while let is block-scoped in JavaScript.
• var keyword is function-scoped, meaning it is accessible throughout the function it is declared in.

• let keyword is block-scoped, meaning it is only accessible within the block it is declared in.

• Using var can lead to variable hoisting issues, while let provides more predictable behavior.

• let allows for better variable scoping and reduces the risk of unintended
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Q1. What are the advantages of pair programming?
Ans. 
Pair programming promotes collaboration, knowledge sharing, and code quality.
• Enhances code quality through immediate code review and feedback

• Promotes knowledge sharing and learning from each other

• Fosters collaboration and teamwork

• Reduces the likelihood of bugs and errors

• Increases productivity by leveraging two minds on the same problem

• Helps in breaking down complex problems into smaller tasks

• Improves communication skil
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Q2. How do you handle constructive feedback about your full-stack development projects?
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Q1. How do you identify bugs in your code?
Ans. 
I use a combination of manual testing, unit testing, and debugging tools to identify bugs in my code.
• Perform manual testing by running the code and checking for any unexpected behavior or errors.

• Write unit tests to verify the functionality of individual components and catch any issues early on.

• Utilize debugging tools like breakpoints, logging, and stack traces to track down the root cause of bugs.

• Collaborate with team ...read more
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Q2. How long have you been coding primarily in Python?
Ans. 
I have been coding primarily in Python for 5 years.
• I started learning Python in college and have been using it extensively in my professional career.

• I have worked on various projects using Python, including web development, data analysis, and automation.

• I am proficient in Python libraries such as NumPy, Pandas, and Django.
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HR round full stack developer experience

Best atitude round questions

Regarding To My Full Stack

Regarding To My Full Stack

Q1. What Is Python And Discuss With Some Questions
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Q2. In that Case Studies
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