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TCS · Software Engineer (Fresher)

TCS Software Engineer (Fresher) Interview Questions (2026): process, questions and answers

Updated 21 October 2026 · prep guide

The TCS Software Engineer (Fresher) interview usually focuses on aptitude, programming basics, core CS subjects, and simple HR questions. Use this page to practice short, clear answers that sound natural, cover fundamentals, and fit the kind of work TCS commonly does in services and consulting.

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How the TCS Software Engineer (Fresher) interview usually works

  1. Aptitude and communication: Candidates commonly report an initial screen with aptitude, verbal ability, and basic reasoning. The goal is usually to test speed, accuracy, and whether you can explain ideas clearly.
  2. Technical basics: Interviewers often ask core questions from programming, OOP, DBMS, operating systems, and computer networks. They usually want correct fundamentals more than advanced depth.
  3. Coding or problem solving: You may be asked to write or explain a simple program, data structure use, or logic for a small problem. Clear thinking, readable code, and edge cases matter.
  4. Project or resume discussion: Expect questions about your final year project, internships, or any practical work you listed. Be ready to explain what you built, your role, and the tools you used.
  5. HR and fit check: The final part often checks communication, flexibility, teamwork, and willingness to learn. Answers should be honest, positive, and connected to the role.

Technical questions and answers

What is the difference between an array and a linked list?

An array stores elements in contiguous memory, so access by index is fast, usually O(1). A linked list stores nodes separately and connects them with pointers, so insertion and deletion are easier when you already have the node, but access is slower because you must traverse from the head. I would choose an array for fast random access and a linked list when frequent insertions and deletions are needed.

What are the main principles of OOP?

The four main principles are encapsulation, inheritance, polymorphism, and abstraction. Encapsulation means keeping data and methods together and controlling access with private or public. Inheritance helps reuse code from a parent class. Polymorphism lets the same method behave differently in different classes. Abstraction means showing only essential details and hiding implementation details.

What is the difference between SELECT, WHERE, and HAVING in SQL?

SELECT chooses which columns to display. WHERE filters rows before grouping, so it works on individual records. HAVING filters grouped results after GROUP BY, so it is used with aggregate functions like COUNT() or SUM(). A simple example is using WHERE salary > 50000 for rows, and HAVING COUNT(*) > 5 for groups.

What is normalization in DBMS?

Normalization is the process of organizing tables to reduce redundancy and avoid update anomalies. It usually involves splitting data into smaller related tables and using keys to connect them. For example, instead of repeating customer details in every order row, we keep customer data in one table and order data in another. Common normal forms include 1NF, 2NF, and 3NF.

What is the difference between a process and a thread?

A process is an independent program in execution with its own memory space. A thread is a smaller unit inside a process that shares the same memory with other threads in that process. Threads are lighter and faster to create, but they need careful synchronization because shared data can cause race conditions. Processes are more isolated, so one crash usually does not affect others directly.

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What is deadlock in operating systems?

Deadlock happens when two or more processes wait forever for resources held by each other. It usually requires four conditions: mutual exclusion, hold and wait, no preemption, and circular wait. A common example is one process holding printer access and waiting for a file, while another holds the file and waits for the printer. Prevention or avoidance methods are used to reduce this problem.

What is a stack and where is it used?

A stack is a linear data structure that follows LIFO, which means last in, first out. The main operations are push, pop, and peek. It is used in function calls, expression evaluation, undo operations, and recursion. For example, when a function calls another function, the call information is stored on the stack until the function finishes.

What is the difference between TCP and UDP?

TCP is connection-oriented and reliable, so it ensures ordered delivery and retransmits lost packets. UDP is connectionless and faster, but it does not guarantee delivery or order. TCP is used when accuracy matters, like web pages or file transfer. UDP is useful for real-time applications like voice or video, where speed is more important than perfect reliability.

What is polymorphism in Java or C++?

Polymorphism means one interface, many forms. In simple terms, the same method name or function call can behave differently depending on the object or arguments. Compile-time polymorphism is usually method overloading, and run-time polymorphism is usually method overriding. This helps write flexible and reusable code, because the same code can work with different types of objects.

What is the difference between GET and POST in HTTP?

GET is used to fetch data from a server, and the parameters are usually visible in the URL. POST sends data to the server in the request body, so it is better for form submissions or sensitive input. GET should not change server data, while POST is commonly used when creating or updating data. GET can be cached more easily.

Scenario questions

You are asked to debug a web application that is slow when loading customer records. How would you approach it?

I would first identify whether the slowdown is in the UI, API, or database. Then I would check query time, network calls, and whether unnecessary data is being fetched. I would suggest indexing common search columns, using pagination, and avoiding repeated calls. The key is to explain a step-by-step method: observe, measure, isolate, fix, and test again.

A client wants a simple attendance system for employees. Which data structures and database ideas would you use?

I would keep employee details in one table and attendance records in another, connected with a foreign key like employee_id. For quick lookups, I would use indexing on frequently searched fields such as date and employee ID. In memory, a hash map can help when checking records by ID. I would also mention validation, duplicate prevention, and role-based access for security.

If two team members give you different solutions for the same problem, how would you decide?

I would compare both solutions on correctness, time complexity, maintainability, and how easy they are to test and support. If both work, I would prefer the simpler one unless performance needs justify the more complex option. I would also ask for feedback from the team or senior developer if needed. The important point is to show collaboration and structured decision-making, not ego.

HR and behavioural questions

Tell me about yourself.

Structure it as present, past, and future. Start with your degree, key skills, and one or two projects or internships. Then mention what you enjoyed learning and how it relates to software development. End with why you are interested in a role like this. Sample answer: 'I am a final-year computer science student with interest in Java, SQL, and problem solving. I have worked on a few academic projects and enjoy learning practical software skills. I am now looking for a role where I can contribute, learn from experienced teams, and grow in a service-based environment.'

Why do you want to join TCS?

Give one reason about learning, one about scale, and one about fit. Mention that you want to work on real business problems, learn from structured processes, and build a strong foundation as a fresher. Sample answer: 'I want to join TCS because it works with a wide range of clients and technologies, which will help me learn quickly. As a fresher, I value a place where I can build strong fundamentals, work in teams, and improve through real projects.'

What is your biggest weakness?

Choose a real but manageable weakness, then explain what you are doing to improve it. Avoid saying something that directly harms the job, like being careless. Sample answer: 'Earlier, I used to spend too much time perfecting small details in my work. I have been improving by setting time limits, prioritizing important tasks first, and asking for feedback early. This has helped me become more balanced and productive.'

Where do you see yourself in 3 years?

Show ambition without sounding unrealistic. Focus on learning, responsibility, and contributing to projects. Sample answer: 'In three years, I want to be someone who understands the company’s processes well, writes clean and reliable code, and handles tasks with less supervision. I also want to improve my technical depth and communication so I can contribute to both the team and the client side of projects.'

Your last 48 hours before the interview

  1. Revise core concepts in OOP, DBMS, operating systems, computer networks, and data structures using short notes.
  2. Practice 10 to 15 basic aptitude questions with a timer, especially percentages, ratios, time and work, and averages.
  3. Write out short answers for common HR questions like self-introduction, strengths, weakness, and why this company.
  4. Review your resume line by line and prepare to explain every project, internship, tool, and technical term you mentioned.
  5. Solve 3 to 5 simple coding problems and speak your logic aloud, including edge cases and time complexity.
  6. Do one full mock interview aloud, then fix weak answers that are too long, vague, or memorized.

Common mistakes to avoid

Frequently asked questions

What questions are asked in TCS fresher interview?

Candidates commonly face aptitude, coding basics, OOP, DBMS, operating systems, computer networks, and HR questions. Interviewers also often ask about projects and simple problem solving. The focus is usually on clear fundamentals and communication.

How should I answer technical questions in a TCS interview?

Start with a direct definition, then add one short example or use case. Keep the answer simple, correct, and structured. If you do not know the full answer, say what you do know and reason carefully instead of guessing.

Do I need advanced coding for a fresher role in TCS?

Usually, you are expected to know basic programming logic, arrays, strings, loops, functions, and simple data structures. Advanced topics may help, but strong fundamentals matter more. Be ready to explain your code clearly and discuss time complexity at a basic level.

How can I prepare in 2 to 3 days for this interview?

Focus on core subjects, practice common aptitude questions, and revise your resume and projects. Do a few simple coding problems and answer HR questions out loud. The main goal is to become clear, calm, and accurate rather than trying to learn everything at once.

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This is an independent preparation guide based on commonly reported interview patterns. The process varies by team, location and year. Interview AI Helper is not affiliated with TCS.

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