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TCS System Engineer Interview Questions and Answers

Updated 11 Jun 2025

728 Interview questions

A System Engineer was asked 1w ago

Q. What is meant by SQL queries?

Ans.

SQL queries are structured commands used to interact with relational databases, enabling data retrieval, manipulation, and management.

SQL stands for Structured Query Language, used for managing relational databases.
Common SQL operations include SELECT (to retrieve data), INSERT (to add data), UPDATE (to modify data), and DELETE (to remove data).
Example of a SELECT query: SELECT * FROM employees WHERE department = ...

A System Engineer was asked 1w ago

Q. Explain what encapsulation is.

Ans.

Encapsulation is a fundamental concept in object-oriented programming that restricts access to certain components.

Encapsulation combines data and methods into a single unit called a class.
It restricts direct access to some of an object's components, which is a means of preventing unintended interference.
For example, a class may have private variables that can only be accessed through public methods (getters and se...

A System Engineer was asked 2w ago

Q. How does CRM work?

Ans.

CRM systems manage customer relationships, streamline processes, and enhance communication to improve business relationships.

Centralizes customer data for easy access and management.
Tracks customer interactions and history for personalized service.
Automates marketing campaigns, like email newsletters.
Facilitates sales tracking and forecasting, e.g., pipeline management.
Enhances customer support with ticketing syst...

A System Engineer was asked 2w ago

Q. What is IP?

Ans.

IP stands for Internet Protocol, a set of rules governing data transmission over networks.

IP addresses are unique identifiers for devices on a network, e.g., 192.168.1.1.
There are two main versions: IPv4 (32-bit) and IPv6 (128-bit).
IP is responsible for routing packets of data between devices.
It operates at the network layer of the OSI model.
IP can be static (fixed) or dynamic (assigned by DHCP).

What people are saying about TCS

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compulsoryaloe

student at

ParulInstituteofengineeringandtechnology

Will i get the offer letter?

I got selected for TCS digital profile and had my interview a few weeks ago. The interview was about 30-40 minutes. All the rounds happened in one go, project based, SQL and a dsa questions were asked which I solved in Python, also answered OOPs related questions in java. My question is how many days will it take to get offer letter from TCS and will joining date also come with offer letter? Thanks for ur time..

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A System Engineer was asked 2w ago

Q. What are the differences between POM and Page Factory design patterns?

Ans.

POM and Page Factory are design patterns in Selenium for enhancing test automation efficiency and maintainability.

POM (Page Object Model) separates test code from UI interactions, promoting reusability.
Page Factory is an extension of POM that uses annotations to initialize web elements.
Example of POM: Create a class for each page with methods for actions (e.g., login).
Example of Page Factory: Use @FindBy annotatio...

A System Engineer was asked 2w ago

Q. What are the key differences between throw and throws keywords in Java?

Ans.

In Java, 'throw' is used to explicitly throw an exception, while 'throws' declares exceptions that may be thrown by a method.

throw: Used to throw an exception explicitly. Example: throw new NullPointerException();
throws: Used in method signatures to declare exceptions that can be thrown. Example: public void myMethod() throws IOException {}
throw can be used anywhere in the method body, while throws is used in the ...

A System Engineer was asked 2w ago

Q. What is the workflow of Spring MVC?

Ans.

Spring MVC is a framework for building web applications in Java, following the Model-View-Controller design pattern.

1. Client sends a request to the DispatcherServlet.
2. DispatcherServlet consults the HandlerMapping to find the appropriate controller.
3. The controller processes the request and returns a ModelAndView object.
4. The DispatcherServlet uses ViewResolver to select the view based on the ModelAndView.
5. T...

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A System Engineer was asked 2w ago

Q. How can you secure your Spring Boot applications? Explain in detail.

Ans.

Securing Spring Boot applications involves implementing various security measures to protect against vulnerabilities.

Use Spring Security for authentication and authorization.
Implement HTTPS to encrypt data in transit.
Validate user inputs to prevent SQL injection and XSS attacks.
Use JWT (JSON Web Tokens) for stateless authentication.
Regularly update dependencies to patch known vulnerabilities.
Configure CORS (Cross-...

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A System Engineer was asked 2w ago

Q. What is a Singleton class?

Ans.

A Singleton class restricts instantiation to a single instance, providing a global point of access to that instance.

Ensures only one instance exists throughout the application.
Provides a global access point to that instance.
Commonly used in logging, configuration settings, and thread pools.
Example in Java: 'public class Singleton { private static Singleton instance; private Singleton() {} public static Singleton g...

A System Engineer was asked 2w ago

Q. Write a program using Java 8 to find the first non-repeated character in the string 'google'.

Ans.

This Java 8 program identifies and returns characters from a string that appear only once.

Use a Map to count occurrences of each character.
Filter the characters to find those with a count of 1.
Example: For 'google', the output should be 'l'.

TCS System Engineer Interview Experiences

1.2k interviews found

System Engineer Interview Questions & Answers

Anonymous

posted on 3 Jan 2025

Interview experience

Excellent

Difficulty level

Easy

Process Duration

Less than 2 weeks

Result

Selected

I applied via Company Website and was interviewed in Dec 2024. There were 2 interview rounds.

Round 1 - Aptitude Test

There are two main sections: foundation and advanced. The foundation section consists of three subsections: quantitative, reasoning, and verbal. If you pass the foundation section but do not clear the advanced section, you will be considered for either the ninja role or the digital role during the interview process. The advanced section includes advanced aptitude questions and two coding questions.

Round 2 - Technical

(5 Questions)

Q1. Can you provide an introduction about yourself?

Ans.

Experienced System Engineer with a strong background in network infrastructure and cloud computing.

Over 5 years of experience in designing, implementing, and maintaining complex IT systems
Proficient in network security protocols and troubleshooting techniques
Skilled in virtualization technologies such as VMware and Hyper-V
Certified in Cisco CCNA and CompTIA Network+
Strong problem-solving and communication skills

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Q2. 3 to 4 questions based on database

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Q3. 2 easy coding questions

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Q4. Questions based on technology that I knew

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Q5. Situation based questions

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Interview Preparation Tips

Interview preparation tips for other job seekers - Focus on the first round, as it can be quite challenging; once you pass it and are selected for an interview, the subsequent process feels considerably easier.

System Engineer Interview Questions & Answers

Anonymous

posted on 4 Mar 2025

Interview experience

Excellent

Difficulty level

Moderate

Process Duration

2-4 weeks

Result

Selected

I appeared for an interview in Feb 2025.

Round 1 - Technical

(3 Questions)

Q1. Streams api calculate second highest salary

Ans.

The Streams API can be used to find the second highest salary from a list of employee salaries efficiently.

Use Streams: Convert the salary list to a stream using `stream()` method.
Sort and Distinct: Use `sorted()` and `distinct()` to get unique salaries in ascending order.
Skip First: Use `skip(1)` to bypass the highest salary.
Find Second: Use `findFirst()` to retrieve the second highest salary.
Example: `OptionalDouble ...

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Q2. Internal working of hashmap

Ans.

A HashMap in Java uses a hash table to store key-value pairs, allowing for efficient data retrieval and storage.

1. HashMap stores data in key-value pairs, where each key is unique.
2. It uses an array of buckets to store the entries, where each bucket can hold multiple entries in case of collisions.
3. The hash function computes an index based on the key's hash code, determining where to store the entry.
4. When a collisi...

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Q3. Pass by value pass by reference concept based output

Ans.

Pass by value copies data, while pass by reference shares memory address, affecting original data differently.

Pass by Value: A copy of the variable is made. Changes do not affect the original variable.
Example: In C++, 'int a = 5; func(a);' - 'a' remains 5 after func execution.
Pass by Reference: A reference to the variable is passed. Changes affect the original variable.
Example: In C++, 'int a = 5; func(&a);' - 'a' ...

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Round 2 - HR

(2 Questions)

Q1. What is current role

Ans.

As a System Engineer, I design, implement, and maintain complex systems to ensure optimal performance and reliability.

Conduct system analysis to identify requirements and specifications.
Develop and implement system architectures, ensuring scalability and security.
Collaborate with cross-functional teams to integrate hardware and software components.
Perform troubleshooting and root cause analysis to resolve system issues...

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Q2. What is expected salary

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Skills evaluated in this interview

System Engineer Interview Questions & Answers

Anonymous

posted on 12 Jan 2025

Interview experience

Excellent

Difficulty level

Easy

Process Duration

Less than 2 weeks

Result

Selected

I applied via TCS and was interviewed in Dec 2024. There was 1 interview round.

Round 1 - Technical

(6 Questions)

Q1. What is hash technology?

Ans.

Hash technology is a method used to convert data into a fixed-size string of characters, typically used for data security and integrity.

Hash technology uses algorithms to generate a unique fixed-size string of characters from input data.
It is commonly used for data security, password storage, digital signatures, and data integrity verification.
Examples of hash algorithms include MD5, SHA-1, and SHA-256.

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Q2. What is block chain?

Ans.

Blockchain is a decentralized, distributed ledger technology used to securely record transactions across multiple computers.

Decentralized database
Consensus mechanism
Immutable record of transactions
Cryptographic security
Smart contracts
Examples: Bitcoin, Ethereum

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Q3. What is DML?

Ans.

DML stands for Data Manipulation Language, used to manage data in a database.

DML is a subset of SQL (Structured Query Language) used to insert, update, delete, and retrieve data in a database.
Examples of DML commands include INSERT, UPDATE, DELETE, and SELECT.
DML is essential for managing and manipulating data within a database system.

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Q4. Convert binay to decimal and viceversa.

Ans.

Binary to decimal conversion involves multiplying each digit by 2 raised to the power of its position.

To convert binary to decimal, start from the rightmost digit and multiply each digit by 2 raised to the power of its position.
Add all the results together to get the decimal equivalent.
For example, to convert binary 1011 to decimal: 1*2^3 + 0*2^2 + 1*2^1 + 1*2^0 = 11.

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Q5. Find max number in array?

Ans.

Iterate through array and compare each element to find the maximum number.

Iterate through the array using a loop.
Compare each element to a variable storing the current maximum number.
Update the variable if a larger number is found.
Return the maximum number at the end.

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Q6. Write basic html , for inserting image and create table.

Ans.

Basic HTML code for inserting image and creating a table

Use <img> tag to insert an image with src attribute
Use <table>, <tr>, <td> tags to create a table structure
Specify image source and table content within respective tags

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