Senior Full Stack Developer

40+ Senior Full Stack Developer Interview Questions and Answers

Updated 7 Jul 2025
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2d ago

Q. 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

1d ago

Q. 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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Asked in Boeing

1d ago

Q. Describe a critical situation you faced and how you solved the problem.

Ans.

In critical situations, I prioritize communication, analysis, and collaboration to effectively resolve issues.

  • Assess the situation quickly: Gather all relevant information to understand the problem.

  • Communicate with the team: Ensure everyone is aware of the issue and their roles in resolving it.

  • Prioritize tasks: Identify the most critical aspects that need immediate attention.

  • Implement a solution: Use a collaborative approach to develop and execute a plan.

  • Review and learn: Aft...read more

Asked in Boeing

5d ago

Q. 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

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1d ago

Q. In ReactJS, when is it best to use state variables versus properties, 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

5d ago

Q. What is the difference between a Service and a 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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Asked in Tracxn

6d ago

Q. 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

Asked in Tracxn

6d ago

Q. 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

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Q. What is the prototype for adding space between characters in a string?

Ans.

The prototype for adding space between characters in a string involves using methods like split and join in JavaScript.

  • Use the split method to convert the string into an array of characters: `let chars = str.split('');`

  • Use the join method to concatenate the characters with a space: `let spacedStr = chars.join(' ');`

  • Example: For `let str = 'hello';`, the result will be `h e l l o`.

Asked in Tracxn

3d ago

Q. 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

Asked in UBS

4d ago

Q. Describe how you would design a system for transferring images and documents to a client.

Ans.

Design a system for transferring images and documents to clients.

  • Use a secure file transfer protocol like SFTP or HTTPS

  • Implement a user-friendly interface for clients to upload and download files

  • Utilize cloud storage for scalability and accessibility

  • Include encryption for data security

  • Implement version control for tracking changes

3d ago

Q. How do you approach problematic situations during production deployment?

Ans.

I prioritize communication, quick assessment, and systematic troubleshooting during production deployment issues.

  • Maintain clear communication with the team and stakeholders to keep everyone informed about the situation.

  • Quickly assess the impact of the issue to determine if a rollback is necessary, as in a case where a new feature causes a critical failure.

  • Implement logging and monitoring tools to identify the root cause of the problem, such as using Sentry for error tracking....read more

Asked in Keelobytes

6d ago

Q. What percentage of your work is dedicated to frontend versus backend development?

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.

Asked in Tracxn

5d ago

Q. What kind of production environment problems have you solved?

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

Q. What is clouser, callbacks , promises and Async and await.

Ans.

Closures, callbacks, promises, and async/await are JavaScript concepts for handling asynchronous operations and scope.

  • Closure: A function that retains access to its lexical scope even when the function is executed outside that scope. Example: `function outer() { let x = 10; return function inner() { return x; }; }`

  • Callback: A function passed as an argument to another function, executed after a certain event or operation. Example: `setTimeout(() => console.log('Hello'), 1000);...read more

6d ago

Q. Consider a 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

Asked in Ciklum

6d ago

Q. 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

Asked in Tracxn

1d ago

Q. How would you implement breadcrumbs 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.

1d ago

Q. What are the reasons for implementing SEO?

Ans.

Implementing SEO enhances online visibility, driving organic traffic and improving user experience on websites.

  • Increased Visibility: Higher search engine rankings lead to more visibility. For example, a local bakery optimizing for 'best cupcakes' can attract more customers.

  • Organic Traffic: SEO helps in attracting visitors without paid ads. A blog on healthy recipes can gain traffic through relevant keywords.

  • User Experience: SEO practices improve site structure and navigation,...read more

1d ago

Q. What is a schema in the context of databases?

Ans.

A schema defines the structure, organization, and constraints of data in a database.

  • A schema includes tables, fields, data types, and relationships between tables.

  • For example, in a 'Users' table, fields might include 'UserID', 'Username', and 'Email'.

  • Schemas can enforce rules, such as unique constraints on 'Username' to prevent duplicates.

  • In relational databases, schemas help maintain data integrity and facilitate queries.

Asked in TCS

4d ago

Q. What is the Event Loop in Node.js?

Ans.

The Event Loop in Node.js manages asynchronous operations, allowing non-blocking execution of code.

  • Node.js operates on a single-threaded event loop, enabling it to handle multiple connections concurrently.

  • The event loop processes events and executes callbacks, ensuring efficient use of resources.

  • It consists of phases: timers, I/O callbacks, idle, poll, check, and close callbacks.

  • Example: When a file read operation is initiated, Node.js continues executing other code while wai...read more

2d ago

Q. How can you host a local WordPress site?

Ans.

You can host a local WordPress site using tools like XAMPP, MAMP, or Local by Flywheel.

  • Install a local server environment like XAMPP or MAMP.

  • Download WordPress from wordpress.org.

  • Place the WordPress files in the server's 'htdocs' or 'www' directory.

  • Create a MySQL database using phpMyAdmin.

  • Configure 'wp-config.php' with database details.

  • Access the site via 'localhost' in your web browser.

Asked in UBS

4d ago

Q. How do you call a REST API in Angular?

Ans.

To call a REST API in Angular, use the HttpClient module to make HTTP requests.

  • Import HttpClientModule in app.module.ts

  • Inject HttpClient in the component/service where API call needs to be made

  • Use HttpClient methods like get(), post(), put(), delete() to make API calls

  • Subscribe to the Observable returned by HttpClient methods to get the response data

  • Handle errors using catchError() method

1d ago

Q. Given a string, find the first non-repeating character in it and return its index. If it does not exist, return -1.

Ans.

To find the first non-repeating character in a string, we can use a frequency count and then identify the first unique character.

  • Use a hash map to count occurrences of each character.

  • Iterate through the string a second time to find the first character with a count of 1.

  • Example: In 'swiss', 'w' is the first unique character.

  • Example: In 'racecar', 'e' is the first unique character.

Asked in S&P Global

1d ago

Q. Is useState asynchronous or synchronous?

Ans.

useState in React is asynchronous, meaning state updates may not reflect immediately after calling setState.

  • useState updates are batched for performance, leading to asynchronous behavior.

  • Example: Calling setCount(count + 1) multiple times in a loop may not yield expected results immediately.

  • To see the updated state, use the useEffect hook or a callback function.

  • React batches state updates in event handlers, making them appear synchronous.

Asked in Keelobytes

6d ago

Q. How familiar are you with frontend technologies?

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

Asked in Tracxn

2d ago

Q. Given two arrays, determine 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

Asked in S&P Global

2d ago

Q. What is the 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

Asked in Sprinto

6d ago

Q. What technologies did you use?

Ans.

I have experience with a variety of technologies including JavaScript, React, Node.js, MongoDB, and AWS.

  • JavaScript

  • React

  • Node.js

  • MongoDB

  • AWS

Asked in Boeing

1d ago

Q. 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

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