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DesignX Mern Full Stack Developer Interview Questions and Answers
DesignX Mern Full Stack Developer Interview Experiences
1 interview found
Sumit Kumar Das
I applied via Naukri.com and was interviewed in Oct 2021. There were 3 interview rounds.
(1 Question)
- Q1. After shortlisted your resume, HR can call you and schedule a date for technical interview.
(1 Question)
- Q1. Asked by the interviewer: 1. Tell me about yourself ? 2. Why you become a MERN developer? 3. Difference between DOM vs Virtual DOM? 4. Do you know how to Redux works? Please Explain? 5. In MongoDB have any...
Interview Preparation Tips
- React.Js
- Nodejs
- MongoDB
- AWS
- Cloud
- Mern
- Full Stack
- Front-end
Interview questions from similar companies
I applied via Recruitment Consulltant and was interviewed in Jun 2024. There was 1 interview round.
(3 Questions)
- Q1. How to optimise performance of a Nodejs app
- Ans.
Optimizing performance of a Nodejs app involves various techniques to improve speed and efficiency.
Use asynchronous programming to handle multiple requests efficiently
Implement caching to reduce redundant database queries
Optimize code by removing unnecessary loops and function calls
Use a load balancer to distribute traffic evenly across multiple servers
Monitor and analyze performance using tools like New Relic or Datad
- Q2. How to optimise React
- Ans.
Optimising React involves code splitting, lazy loading, using PureComponent, avoiding unnecessary re-renders, and using memoization.
Use code splitting to load only necessary components
Implement lazy loading for components that are not immediately needed
Utilize PureComponent to prevent unnecessary re-renders
Avoid unnecessary re-renders by using shouldComponentUpdate or React.memo
Use memoization techniques like useMemo o
- Q3. What is a callback?
- Ans.
A callback is a function that is passed as an argument to another function and is executed after the completion of that function.
Callbacks are commonly used in asynchronous programming to handle tasks that take time to complete.
They allow for functions to be executed once a certain task is completed, without blocking the rest of the code.
Example: setTimeout function in JavaScript takes a callback function as an argumen
Interview Preparation Tips
- React.Js
- Nodejs
- Javascript
Skills evaluated in this interview
I applied via Job Portal and was interviewed in Mar 2024. There was 1 interview round.
(7 Questions)
- Q1. What is your Role and responsibility in your current organization?
- Q2. What Kind of Production environments do you solve?
- Ans.
I solve complex production environments by identifying issues, optimizing performance, and implementing solutions.
Identifying bottlenecks and optimizing performance
Troubleshooting and resolving production issues
Implementing scalable solutions for high traffic websites
Working with cloud services like AWS or Azure
Automating deployment processes with tools like Jenkins or Docker
- Q3. What Features you have worked on? Explain 1 feature?
- Ans.
Developed a real-time chat feature for a social networking platform.
Implemented WebSocket technology for instant messaging
Designed user interface for chat window with message history
Integrated push notifications for new messages
Developed backend logic for message encryption and decryption
- Q4. How did you prepare the design doc for this feature? What was your Approach?
- Ans.
I prepared the design doc by outlining the requirements, architecture, data flow, and user interactions.
Outlined the requirements and goals of the feature
Defined the architecture and technologies to be used
Described the data flow and interactions between components
Included wireframes or mockups for user interfaces
Listed potential edge cases and how to handle them
- Q5. Find if Array2 is a substring of Array1
- Ans.
Check if Array2 is a substring of Array1
Iterate through Array1 and check if each element contains Array2
Use built-in string functions like includes() or indexOf() to check for substring
Consider edge cases like empty arrays or arrays with empty strings
- Q6. How will you build breadcrums in react?
- Ans.
Breadcrumbs in React can be built using a combination of state management and conditional rendering.
Create a state variable to store the breadcrumb data.
Update the state variable as the user navigates through the application.
Render the breadcrumbs component with the data stored in the state.
- Q7. How will you design a parking system? What api's will you create ? Their body and response object.
- Ans.
Design a parking system with APIs for managing parking spots and reservations.
Create API for adding new parking spots with details like location, availability, and pricing
Create API for listing available parking spots based on location and availability
Create API for reserving a parking spot with user details and duration
Create API for cancelling a parking reservation
Response object for adding parking spot: { success: t...
Skills evaluated in this interview
I applied via Company Website and was interviewed in Mar 2024. There were 3 interview rounds.
Was given a DSA problem on squares it was relatively easy.
Was giving another problem as regards longest sub array without repeating letters.
(2 Questions)
- Q1. What is git grep
- Ans.
git grep is a command in Git that allows you to search through the contents of files in a Git repository.
Allows searching through the contents of files in a Git repository
Similar to the 'grep' command in Unix/Linux
Can be used to search for specific strings or patterns in files
Useful for finding references to functions, variables, or text within the codebase
- Q2. What is profilers
- Ans.
Profilers are tools used to analyze the performance of software applications by measuring various metrics such as CPU usage, memory usage, and execution time.
Profilers help identify bottlenecks and optimize code for better performance.
Examples of profilers include VisualVM, YourKit, and Xcode Instruments.
Profiling can be done for different aspects of an application, such as CPU profiling, memory profiling, and network
Interview Preparation Tips
- Python
- Javascript
Skills evaluated in this interview
Assessments of data structure and JS and Angular
Selected
I applied via Naukri.com and was interviewed before Nov 2022. There were 2 interview rounds.
(5 Questions)
- Q1. Puzzle of 7 horses
- Q2. Not sure, look it up online
- Q3. 2d Matrix problems
- Q4. Coding questions on Array
- Q5. Coding Question on String
Interview Preparation Tips
Full Stack Software Developer Interview Questions & Answers
Paisabazaar.com
Anonymous
posted on 2 Nov 2023
Selected
I applied via Referral and was interviewed before Nov 2022. There were 2 interview rounds.
(2 Questions)
- Q1. Some code javascript outputs
- Q2. Some errors in javascript code
Q 1 print string in tringal farmat
Q2 print duplicate string in two array
(1 Question)
- Q1. About core java over all
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