TCS Interview Questions, Process, and Tips

Aptitude round
English exam
Maths tricky questions exam
Coding 1 easy 1 tuff

Q1. Difference between css and css3
Ans. 
CSS is the standard styling language for websites, while CSS3 is the latest version with new features like animations and transitions.
• CSS is the standard styling language used for describing the look and formatting of a document written in HTML.

• CSS3 is the latest version of CSS with new features like animations, transitions, gradients, and more.

• CSS3 introduced new layout modules like Flexbox and Grid, making it easier ...read more
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Q2. Tell disadvantages of your projects
Ans. 
Some disadvantages of my projects include scalability issues, lack of documentation, and limited testing.
• Scalability issues: The project was not designed to handle a large amount of data or users, leading to performance issues.

• Lack of documentation: There was insufficient documentation on the codebase, making it difficult for new team members to onboard or for future maintenance.

• Limited testing: Due to time constraints...read more
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Q1. Are you okay for night shift
Ans. 
Yes, I am okay with night shifts as I am comfortable working during those hours.
• I have previous experience working night shifts in my previous job.

• I am a night owl and tend to be more productive during late hours.

• I understand the importance of round-the-clock support in the software industry.
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Q2. Are you okay with reallocation
Ans. 
Yes, I am okay with reallocation as it is a common practice in the software engineering field.
• I am comfortable with reallocation as it is a common practice in software development.

• I understand that reallocation may be necessary for project requirements or team dynamics.

• I am adaptable and willing to take on new challenges that may come with reallocation.
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Basic multiple-choice questions on object-oriented programming (OOP) and database management systems (DBMS), along with a coding question focused on arrays.

Q1. What is the difference between RESTful APIs and SOAP APIs?
Ans. 
RESTful APIs are lightweight, stateless, and use standard HTTP methods, while SOAP APIs are more rigid, use XML for messaging, and have built-in security features.
• RESTful APIs are lightweight and stateless, making them easier to scale and maintain.

• SOAP APIs are more rigid and use XML for messaging, which can be more complex and less flexible.

• RESTful APIs use standard HTTP methods like GET, POST, PUT, DELETE, while SOAP...read more
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Q2. What are microservices?
Ans. 
Microservices are a software development technique where applications are broken down into small, independent services that communicate with each other.
• Microservices are designed to be small, focused, and independently deployable.

• Each microservice typically performs a specific business function and communicates with other services through APIs.

• Microservices allow for greater flexibility, scalability, and resilience in ...read more
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An aptitude test evaluates an individual's potential to excel in a specific area by assessing their strengths and weaknesses in particular abilities.

An assessment that measures an individual's inherent abilities and potential for success in a specific activity.

A coding test is a programming assessment designed to evaluate a candidate's coding skills. It is a standard component of the technical hiring process for software developers and programmers.

Assessment that evaluates a candidate's coding skills

Group discussion (GD) topics for interviews may cover areas such as business, social issues, and current affairs. GDs serve to evaluate a candidate's communication, leadership, and teamwork abilities.

Discussion assignments are prompts that your teacher may assign to you. By participating in these discussions, you can reflect on your learning, share ideas and opinions, or ask and answer questions. Discussions may require you to respond to individual questions or provide multiple responses to an ongoing conversation.

Basic aptitude prepare from indiabix. keep up with the time you will easily clear the round.

1-easy questions of array/string
2-medium level question of linear DSA(stack,queue,LL,Array, string)

Q1. SQL queries were asked, and DDL DML DCL TCL
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Q2. OOPS: constructor, polymorphism with real life example
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Q3. 5 things about why should we hire you
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Q4. Describe your college life
Ans. 
My college life was a whirlwind of new experiences, friendships, and academic challenges.
• Joined various clubs and organizations to meet new people and explore interests

• Balanced studying with social activities to maintain a healthy lifestyle

• Participated in internships and research projects to gain practical experience

• Attended lectures and seminars to expand knowledge and skills

• Enjoyed campus events and traditions to cre
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Q1. What are the key considerations for implementing S/4HANA?
Ans. 
Key considerations for implementing S/4HANA include system readiness, data migration, business process alignment, and user training.
• Ensure system readiness by checking hardware and software requirements

• Plan for data migration from existing systems to S/4HANA

• Align business processes with S/4HANA functionalities for optimal performance

• Provide comprehensive user training to ensure smooth adoption of the new system
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Q2. What real-time issues have you encountered during upgrades?
Ans. 
Real-time issues during upgrades include data migration errors, system downtime, and compatibility issues.
• Data migration errors can lead to loss of important information or corruption of data.

• System downtime during upgrades can disrupt business operations and cause financial losses.

• Compatibility issues with other systems or applications can result in integration problems and functionality issues.
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Q1. Tell me about your project.
Ans. 
Developed a real-time data processing system for analyzing customer behavior on an e-commerce platform.
• Used Apache Kafka for real-time data streaming

• Implemented data pipelines using Apache Spark for processing large volumes of data

• Designed and optimized data models in PostgreSQL for storing and querying customer data
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Q2. What are the Types of SCD?
Ans. 
Types of SCD include Type 1, Type 2, and Type 3.
• Type 1 SCD: Overwrites old data with new data, no history is maintained.

• Type 2 SCD: Maintains historical data by creating new records for changes.

• Type 3 SCD: Creates separate columns to store historical and current data.

• Examples: Type 1 - Employee address updates overwrite old address. Type 2 - Employee salary changes create new record with effective date. Type 3 - Employ
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Q3. Delta Lake vs Data Lake?
Ans. 
Delta Lake is an open-source storage layer that brings ACID transactions to Apache Spark and big data workloads.
• Delta Lake provides ACID transactions, schema enforcement, and data versioning on top of data lakes.

• Data Lake is a centralized repository that allows you to store all your structured and unstructured data at any scale.

• Delta Lake is optimized for big data workloads and is built on top of Apache Spark.

• Data Lake...read more
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Q4. How to write a file in a delta table?
Ans. 
To write a file in a delta table, you can use the Delta Lake API or Spark SQL commands.
• Use Delta Lake API to write data to a delta table

• Use Spark SQL commands like INSERT INTO to write data to a delta table

• Ensure that the data being written is in the correct format and schema
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Q5. What are optimisation techniques used in the project?
Ans. 
Optimisation techniques used in the project include indexing, query optimization, caching, and parallel processing.
• Indexing: Creating indexes on frequently queried columns to improve search performance.

• Query optimization: Rewriting queries to make them more efficient and reduce execution time.

• Caching: Storing frequently accessed data in memory to reduce the need for repeated database queries.

• Parallel processing: Distri...read more
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Q6. What is the difference between Tasks, and stages? About Spark UI?
Ans. 
Tasks and stages are components of the execution plan in Spark UI.
• Tasks are the smallest unit of work in Spark, representing a single operation on a partition of data.

• Stages are groups of tasks that are executed together as part of a larger computation.

• Tasks within a stage can be executed in parallel, while stages are executed sequentially.

• Tasks are created based on the transformations and actions in the Spark applicat...read more
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Q7. Role of DAG ins aprk ?
Ans. 
DAG (Directed Acyclic Graph) in Apache Spark is used to represent a series of data processing steps and their dependencies.
• DAG in Spark helps optimize the execution of tasks by determining the order in which they should be executed based on dependencies.

• It breaks down a Spark job into smaller tasks and organizes them in a way that minimizes unnecessary computations.

• DAGs are created automatically by Spark when actions a...read more
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Q8. What transformation techniques you have used in your project?
Ans. 
I have used various transformation techniques such as data cleaning, normalization, aggregation, and feature engineering in my projects.
• Data cleaning to remove missing values and outliers

• Normalization to scale numerical features

• Aggregation to summarize data at different levels

• Feature engineering to create new relevant features
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Q1. About my project?
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Q2. Some scenario-based questions related to project and work?
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Q3. How do I keep myself updated with the latest technologies?
Ans. 
I keep myself updated by regularly attending conferences, workshops, online courses, and reading industry blogs.
• Attend conferences and workshops related to data engineering

• Take online courses on platforms like Coursera, Udemy, or DataCamp

• Read industry blogs and follow thought leaders on social media

• Join online communities and forums to discuss latest technologies and trends
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