Carwale Mern Full Stack Developer Interview Questions and Answers

Q1. Difference between exe and dll
Ans. 
Exe is an executable file that can be run independently, while DLL is a dynamic link library that is loaded by programs when needed.
• Exe stands for executable file, while DLL stands for dynamic link library.

• Exe files can be run independently, while DLL files are loaded by programs when needed.

• Exe files have their own memory space, while DLL files share memory space with the calling process.

• Exe files are typically larger...read more
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Q2. What are http verbs
Ans. 
HTTP verbs are used to indicate the action to be performed on a resource in a RESTful API.
• GET - retrieve data from a server

• POST - send data to a server to create/update a resource

• PUT - update a resource on the server

• DELETE - remove a resource from the server

• PATCH - partially update a resource on the server
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Q3. What is method overloading and overriding Output based question
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Q4. Linq query to filter data and group by
Ans. 
Use Linq query to filter data and group by in C#
• Use 'Where' method to filter data based on a condition

• Use 'GroupBy' method to group the filtered data based on a key

• Example: var result = data.Where(x => x.Property == value).GroupBy(x => x.GroupKey)
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Q5. Attribute in mvc
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An attribute in MVC is a piece of metadata that provides additional information about a model, view, or controller.
• Attributes are used to add behavior or data to a class or method in MVC

• They can be used for validation, authorization, caching, etc.

• Examples include [Required], [Authorize], [OutputCache]
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Q1. What is your Role and responsibility in your current organization?
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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
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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
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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
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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
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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.
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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...read more
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It was an online test

Q1. Basic DSA Questions
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Q1. Tell me about yourself
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Q1. Web development
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Q2. What is useref in react
Ans. 
useRef is a hook in React that allows you to create a mutable ref object.
• useRef is used to access DOM nodes or store mutable values that persist across renders.

• It can be used to focus an input field, measure the size of an element, or store previous values.

• Example: const inputRef = useRef(null);
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Q1. React in deep and project
Ans. 
React is a JavaScript library for building user interfaces, commonly used in web development projects.
• React is a declarative, efficient, and flexible JavaScript library for building user interfaces.

• It allows developers to create reusable UI components that can be easily composed to build complex user interfaces.

• React uses a virtual DOM to improve performance by only updating the parts of the actual DOM that have change...read more
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Q1. Tell me about yourself
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Q1. The interview process really went smooth. The questions were mostly asked of List Comprehension, React and MVC Architectural patterns.
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Q2. The questions were mostly into Docker, Rendering lists, React, and high level architectural principles
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Q1. Final round was mostly about discussion into culture fit rounds, questionnaire regarding ethics.
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Q1. Can you outline a simple strategy for fallback error handling in a Node.js application using async/await?
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Assessments of data structure and JS and Angular

Q1. Asked for experience and background
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Q1. Technical questions
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Prectical test on relevant experience and position requirements.

Q1. Salary discussion and all
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