Senior Full Stack Developer

20+ Senior Full Stack Developer Interview Questions and Answers

Updated 17 Sep 2024

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Q1. How the clients of one domain will be made to access the API service? How do the different domains based clients authentication and authorization are managed in the API service

Ans.

Clients of one domain can access API service through authentication and authorization managed by API service.

  • API service can use OAuth2.0 for authentication and authorization

  • Different domains can have different client IDs and secrets for OAuth2.0

  • API service can use JWT for token-based authentication

  • Cross-Origin Resource Sharing (CORS) can be used to allow access from different domains

Q2. How do you configure the Authentication system in API service and how do you ensure that it is not hacked from external sources

Ans.

Authentication system in API service must be configured securely to prevent external hacking.

  • Use strong encryption algorithms to store passwords

  • Implement multi-factor authentication

  • Use HTTPS protocol to encrypt data in transit

  • Implement rate limiting to prevent brute force attacks

  • Regularly update and patch the authentication system

  • Use secure coding practices to prevent injection attacks

Senior Full Stack Developer Interview Questions and Answers for Freshers

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Q3. Which is the best to use either the State variables or Properties in ReactJS and why

Ans.

State variables are best for managing component's internal state, while properties are best for passing data from parent to child components.

  • State variables are mutable and can be changed within the component

  • Properties are immutable and cannot be changed within the component

  • State variables are used to manage the component's internal state

  • Properties are used to pass data from parent to child components

  • State variables are defined within the component's constructor

  • Properties are...read more

Q4. What is the difference between Service and Component in Angular

Ans.

Service provides data and functionality while Component handles UI and user interaction.

  • Service is a singleton object that can be injected into multiple components

  • Component is a directive with a template and styles

  • Service provides data and functionality to components

  • Component handles UI and user interaction

  • Services can be used to share data between components

  • Components can communicate with services using dependency injection

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Q5. Any idea which increased performance and have benefited in delivery

Ans.

Implementing caching mechanisms has significantly increased performance and improved delivery times.

  • Utilizing caching mechanisms such as Redis or Memcached to store frequently accessed data

  • Implementing CDN (Content Delivery Network) to cache static assets and reduce server load

  • Optimizing database queries and indexing to improve retrieval speed

  • Implementing lazy loading for images and resources to reduce initial load times

Q6. 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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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: true, message: 'Parking spot added successfully' }

  • Response ...read more

Q8. 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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Q9. How much % of your work goes to frontend and backend

Ans.

Approximately 60% of my work goes to frontend and 40% to backend development.

  • I spend more time on frontend development due to the user interface requirements.

  • Backend work involves server-side logic, database management, and API integrations.

  • Balancing both frontend and backend ensures a seamless user experience and efficient functionality.

Q10. 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

Q11. Consider couple of microservices, explain the flow?

Ans.

Microservices communicate through APIs to exchange data and perform actions.

  • Microservices are independent and self-contained

  • Each microservice has its own API

  • APIs are used to communicate between microservices

  • Data is exchanged through APIs

  • Microservices can perform actions based on data received from other microservices

Q12. System Design and SOLID principles with node js design patterns

Ans.

System design in Node.js involves applying SOLID principles and design patterns for scalable and maintainable applications.

  • Use SOLID principles (Single Responsibility, Open/Closed, Liskov Substitution, Interface Segregation, Dependency Inversion) to design modular and flexible systems.

  • Apply design patterns like MVC, Factory, Singleton, Observer, etc. to address common design problems and improve code reusability.

  • Utilize Node.js features like event-driven architecture, non-blo...read more

Q13. 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.

Q14. How familiar are you with frontend

Ans.

I am very familiar with frontend development, with experience in various frameworks and technologies.

  • Proficient in HTML, CSS, and JavaScript

  • Experience with frontend frameworks like React, Angular, and Vue.js

  • Knowledge of responsive design and cross-browser compatibility

  • Familiarity with frontend build tools like Webpack and Babel

Q15. 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

Q16. Difference between useMemo and Memo?

Ans.

useMemo is a hook used for memoization in React to optimize performance, while Memo is a higher order component used for memoization.

  • useMemo is a hook in React that memoizes a function and returns the memoized value.

  • Memo is a higher order component in React that memoizes the component and prevents unnecessary re-renders.

  • useMemo is typically used for memoizing expensive calculations or functions, while Memo is used for memoizing components.

  • Example: useMemo(() => calculateValue...read more

Q17. Difference between array and sets

Ans.

Arrays are ordered collections of elements with duplicate values allowed, while sets are unordered collections of unique elements.

  • Arrays allow duplicate values, while sets do not.

  • Arrays are ordered, while sets are unordered.

  • Arrays are accessed by index, while sets do not have a specific order.

  • Example: Array - [1, 2, 3, 3], Set - {1, 2, 3}

Q18. Cookie vs Token

Ans.

Cookies are stored on the client side while tokens are stored on the server side for authentication purposes.

  • Cookies are sent with every HTTP request, while tokens are typically sent in the Authorization header.

  • Cookies can be vulnerable to CSRF attacks, while tokens can be more secure if implemented correctly.

  • Cookies have a size limit of 4KB, while tokens can store more data.

  • Cookies are typically used for session management, while tokens are commonly used for authentication i...read more

Q19. Event driven design implementation

Ans.

Event driven design is a software architecture pattern where events trigger actions.

  • Events are used to communicate between different components of the system

  • Event handlers are responsible for processing events and triggering actions

  • Event driven design promotes loose coupling and scalability

  • Examples include message queues, pub/sub systems, and reactive programming

  • Commonly used in microservices architecture

Q20. React- Functional Vs Class Component

Ans.

Functional components are simpler, lightweight, and easier to read, while class components have more features like state and lifecycle methods.

  • Functional components are just plain JavaScript functions that take props as an argument and return React elements.

  • Class components are ES6 classes that extend from React.Component and can have state and lifecycle methods.

  • Functional components are easier to test and maintain, while class components can be more powerful and have access ...read more

Q21. What is closure

Ans.

Closure is a function that has access to its own scope, as well as the scope in which it was defined.

  • Closure allows a function to access variables from its outer scope even after the outer function has finished executing.

  • It is created whenever a function is defined within another function.

  • Closure is commonly used in event handlers, callbacks, and asynchronous code.

Frequently asked in,

Q22. Deployment Process in Cloud?

Ans.

Deployment process in cloud involves creating a package, selecting a deployment method, and configuring the deployment environment.

  • Create a package containing all necessary files and dependencies

  • Select a deployment method such as continuous integration/continuous deployment (CI/CD) or manual deployment

  • Configure the deployment environment by setting up servers, databases, and other resources

  • Deploy the package to the environment using the selected deployment method

  • Monitor the d...read more

Q23. What is REST API

Ans.

REST API is a set of rules and conventions for building and interacting with web services.

  • REST stands for Representational State Transfer

  • It is an architectural style for designing networked applications

  • REST APIs use HTTP methods like GET, POST, PUT, DELETE to perform operations on resources

  • Resources are identified by URLs and can be represented in different formats like JSON, XML

  • REST APIs are stateless and can be easily consumed by different clients

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