Senior Full Stack Developer
20+ Senior Full Stack Developer Interview Questions and Answers
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
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
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
Q3. Which is the best to use either the State variables or Properties in ReactJS and why
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
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
Q5. Any idea which increased performance and have benefited in delivery
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?
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.
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?
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
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?
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?
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
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?
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
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
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?
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
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
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
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
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
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.
Q22. Deployment Process in Cloud?
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
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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