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Preparing for a TCS full stack developer interview requires comprehensive readiness across various domains of software development. Explore comprehensive TCS Full Stack Developer Interview Questions and Answers to prepare for technical assessments and interviews. These questions cover a range of topics essential for full-stack developers, including front-end and back-end technologies.
Overview of TCS
Tata Consultancy Services (TCS) is a part of the Tata Group, one of India’s largest and oldest business conglomerates. Founded in 1968, TCS has grown to become one of the world’s leading IT services firms, with a presence in over 46 countries and a workforce of more than 600,000 employees. TCS offers a wide range of services, including consulting, IT infrastructure services, engineering and industrial services, and business process outsourcing.
Tata Consultancy Services (TCS) is an Indian multinational information technology (IT) service, consulting and business solutions company headquartered in Mumbai, Maharashtra. It is a subsidiary of the Tata Group and operates in 47 countries. As of 2025, Tata Consultancy Service is ranked 14th overall in the Forbes World’s Most Innovative Companies ranking, making it both the highest-ranked IT services company and the top Indian company on the list.
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Why Join TCS as a Full Stack Developer?
1: Which of the following is a JavaScript framework/library?
1. Work-life balance
Often, people working in software industry find it very hard to maintain the work-life balance. However, 23% people believe that TCS offers them opportunity to balance their work as well as their personal life.
2. Brand name
In recent years, IT companies have grown like mushrooms, especially in India but only a few are able to provide a sustainable career to their employees. That’s why people prefer working with big brands. Getting associated with a brand not only gives you a satisfaction that you are going on a right career path, but also ensure job security to some extent. About 23% employees (from the 4,600+ responders) think that TCS is a brand that can help them boost their career.
3. Work environment
Another important factor that lures the workforce towards TCS is the company’s work environment. About 16% of employees voted TCS for providing a favourable and healthy work environment.
4. People/colleagues
Colleagues are the people with whom you spend most of your time at workplace. Also, for running a project successfully, an understanding and cooperative team is an absolute necessity. About 15% of the respondents say that it is one of the major reasons they are associated with TCS.
5. Leave policy
People tend to like a company that understands the needs of its workforce. An employee-friendly leave policy and regulations are among the top five reasons why people continue to work with the firm. 14% people have approved of TCS of having good leave policy.
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Get Hired as a Full-Stack Developer: Master the Skills Employers Are Looking For!
Start Learning With EMI Payment OptionsTCS Full Stack Developer Interview Questions 2025
The interview process at TCS for a full stack developer position is comprehensive, covering a range of topics from technical skills to problem-solving abilities and cultural fit. Here is a detailed list of potential interview questions you might encounter:
I) Technical Questions:
1. What do you know about Full stack Web Development?
Answer: Full stack web Development refers to the development of both front end and back end of web application. They work on the frontend, backend, database, and debugging of web applications.
2. Which Tools are used for Full stack web development?
Answer: Some of the important Full stack development tools are:
- Code editors like Visual Studio Code, IntelliJ IDEA, and Sublime Text.
- Browser Developer Tools
- Frameworks like Angular, React, and Vue.js
- CSS Preprocessors like Sass and LESS
- Responsive Design Tools like Bootstrap.
3. What is the difference between Front end and Back end development?
Answer: Front end is the visible part of web application or website, in which the user interacts directly. Whereas, back end is server-side development of web application or website. It contain all the code required for the application to run, including integrations with data systems, communicating with other applications, and processing data.
4. Which languages are required for front end web development?
Answer: HTML, CSS, JavaScript are the most common front end languages.
5. Can you write the basic structure of HTML.
Answer: Basic structure of HTML is as follows:
<html>
<head>
<title>Page Title</title>
</head>
<body>
<h2>Heading</h2>
<p>Hello World</p>
</body>
</html>
6. How to create a table in HTML? Show an example.
<html>
<head>
<title>Page Title</title>
</head>
<body>
<h2>Heading</h2>
<p>Hello World</p>
<table>
<tr>
<th>Name</th>
<th>Age</th>
</tr>
<tr>
<td>John</td>
<td>34</td>
</tr>
<tr>
<td>Williams</td>
<td>42</td>
</tr>
</table>
</body>
</html>
Output:
Heading
Hello World
| Name | Age |
|---|---|
| John | 34 |
| Williams | 42 |
7. What is the difference between <th> tag and <td> tag
Answer: <th> tag is used for table header cells while <td> tag is used for table data cells.
8. What is colspan and rowspan in HTML? What is its syntax?
Answer: Colspan Allows a single table cell to span the width of more than one cell or column. While Rowspan allows a single table cell to span the height of more than one cell or row.
Syntax:
<th colspan=”2″>Alice</th>
<th colspan=”2″>Bob</th>
<th colspan=”2″>Julie</th>
</tr>
<th rowspan=”3″>Marks</th>
<th rowspan=”3″>Percentage</th>
</tr>
9. How to add CSS to HTML?
Answer: To add CSS to HTML, there are 3 primary methods:
- Inline CSS: Apply styles directly to HTML elements using the style attribute.
- Internal CSS: Use a <style> tag within the <head> section of the HTML document.
- External CSS: Link to an external CSS file using a <link> tag within the <head> section.
10. How to add JavaScript externally?
Answer: To add JavaScript externally to an HTML document, we should create a separate JavaScript file and then link to that file from your HTML document using the <script> tag with the src attribute.
Syntax: <script src = “script.js”></script>
11. What is PHP?
Answer: · PHP is an acronym for “Hypertext Preprocessor“. PHP is an open source server side scripting language specifically used for web development.
12. What are the differences between CSS Grid and Flexbox.
- CSS Grid provides two-dimensional layout capabilities. This means it can handle both rows and columns. Flexbox was designed for layout in one dimension. It handles either a row or a column at a time.
- CSS Grids helps you create the outer layout of the webpage. You can build complex as well responsive design with this. This is why it is called ‘layout first’. Flexbox mostly helps align content & move blocks.
13. What is virtual DOM and what are its benefits
The virtual DOM (VDOM) is a programming concept where an ideal, or “virtual”, representation of a UI is kept in memory and synced with the “real” DOM by a library such as ReactDOM.
Benefits of the Virtual DOM
- Performance Optimization:
- The virtual DOM reduces the number of direct manipulations of the real DOM, which can be slow and resource-intensive. By batching updates and applying only the necessary changes, React improves overall performance.
- Declarative UI:
- Developers can write declarative UI code, focusing on how the UI should look based on the current state rather than managing the UI updates manually. React handles the efficient updates behind the scenes.
- Simplified Development:
- The virtual DOM allows developers to think in terms of component states and props, abstracting away the complexity of direct DOM manipulation. This makes the development process more intuitive and less error-prone.
- Cross-Platform Consistency:
- The virtual DOM provides a consistent way to describe the UI, regardless of the platform. This makes it easier to create applications that work across different environments, such as web, mobile, and desktop.
- Improved Debugging:
- Since the virtual DOM maintains a representation of the UI in memory, it can be used for debugging purposes. Tools like React DevTools allow developers to inspect the virtual DOM and understand how state changes affect the UI.
- Component-Based Architecture:
- The virtual DOM complements React’s component-based architecture, enabling reusable, self-contained components. Each component manages its own state and virtual DOM, promoting modularity and maintainability.
14. What are the main differences between Angular, React, and Vue.js?
Angular, React, and Vue.js are three of the most popular JavaScript frameworks and libraries for building web applications. Here are the differences:
Angular
- Angular is a full-fledged framework for building client-side applications.
- It primarily uses TypeScript, a statically typed superset of JavaScript. This offers strong typing and advanced features for large-scale applications.
- It follows a component-based architecture but with a more opinionated structure. It uses modules, components, services, and dependency injection.
- It is suitable for large-scale enterprise applications where a comprehensive solution and strong typing are beneficial.
React
- React is a JavaScript library focused on building user interfaces, particularly single-page applications.
- It primarily uses JavaScript (often with JSX, a syntax extension for embedding HTML within JavaScript). TypeScript is also commonly used.
- It follows a component-based architecture with a focus on a unidirectional data flow. It uses functional or class components.
- It is suitable for applications where flexibility is needed, such as dynamic user interfaces, single-page applications, and mobile apps (using React Native).
Vue.js
- Vue.js is a progressive framework for building user interfaces. It can function as a library or a full-fledged framework depending on your needs.
- It primarily uses JavaScript, with support for TypeScript.
- It follows a component-based architecture similar to React and Angular. It provides a reactive and declarative approach to building UIs.
- It is suitable for both small and large applications. It’s particularly popular in the community-driven development space and for projects where quick development and ease of integration are important.
15. Explain the concept of RESTful services and how they work.
RESTful services, or RESTful APIs (Application Programming Interfaces), are a way to provide interoperability between computer systems on the internet. REST stands for Representational State Transfer, which is an architectural style that dictates how web services should be designed to facilitate communication and data exchange.
How RESTful Services Work
- Client Request:
- The client sends an HTTP request to the server. The request includes the method (e.g., GET, POST), the URL identifying the resource, and potentially additional data in the request body (for POST, PUT, PATCH) or query parameters.
- Server Processing:
- The server receives the request, processes it, and interacts with the backend, such as databases or other services, to retrieve or modify the resource as needed.
- Response:
- The server sends an HTTP response back to the client. The response includes a status code indicating the result of the request (e.g., 200 OK, 201 Created, 404 Not Found), and optionally a body containing the resource representation or error message.
16. What is the difference between GET and POST Method
Answer: GET method is primarily utilised at the client-side to transmit a request to a particular server to get the data. GET is used for retrieving data like searching, filtering, or paging. Whereas, POST method is primarily utilised at the client-side to transmit data to a particular server. POST is used for submitting forms, modifying data, or creating new resources.
II) Behavioral Questions:
1. Tell me about yourself.
2. What are your greatest strengths?
3. Where do you see yourself in five years?
4. Describe your working style?
5. Are you a team player?
The company expects you to be a team player. So, always say this and keep some examples ready to support your answer.
6. How would you be an asset to our organization?
7. What are your weaknesses?
8. Why do you want to work at TCS?
9. Can you work under pressure?
Conclusion
TCS is a dream company for candidates seeking career growth, and a decent job environment and good interview preparation can easily help you make your way into this IT giant. Joining TCS as a full stack developer offers numerous benefits, from working with cutting-edge technologies to gaining global exposure and professional development opportunities, for instance. In conclusion The interview process is thorough and designed to assess a candidate’s technical skills, problem-solving abilities, and cultural fit but by preparing for the questions outlined in this blog, candidates can approach their TCS interviews with confidence and a clear understanding of what to expect. Whether you are a seasoned developer or just starting in your career, TCS provides a dynamic and supportive environment to grow and succeed in the ever-evolving field of technology.
Experience the power of our web development course with a free demo – Enroll now!
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Get Hired as a Full-Stack Developer: Master the Skills Employers Are Looking For!
Start Learning With EMI Payment OptionsFrequently Asked Questions
What is a Full Stack Developer?
A full stack developer is proficient in both front-end and back-end development, capable of working on all layers of a web application.
What technologies should a Full Stack Developer know?
Key technologies include HTML, CSS, JavaScript, React or Angular for front-end, Node.js or Django for back-end, and databases like MongoDB or SQL.
Explain the role of RESTful APIs in web development.
RESTful APIs allow different software systems to communicate over HTTP by providing a standardized way to perform CRUD operations.
How do you ensure the security of a web application?
Implement security best practices like HTTPS, input validation, authentication, authorization, and regular security audits.
What are some common challenges faced in full stack development?
Common challenges include keeping up with rapid technology changes, managing complex application states, and ensuring seamless integration between front-end and back-end systems.
