TCS DOT NET Developer Interview Questions, Process, and Tips for Experienced

Q1. It was a combination of two interviews in one. Technical and Managerial interview was taken in one call and it was 1.5 hr long. It consisted of some technical and managerial level questions and with the di...read more
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Q2. Explain Solid Principles
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Solid Principles are a set of five design principles for writing clean, maintainable, and scalable code.
• Single Responsibility Principle (SRP) - A class should have only one reason to change.

• Open/Closed Principle (OCP) - Classes should be open for extension but closed for modification.

• Liskov Substitution Principle (LSP) - Objects of a superclass should be replaceable with objects of its subclasses without affecting the ...read more
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Q3. Questions about scenarios in polymorphism
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Q4. Dependency Injection and how to implement that.
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Dependency Injection is a design pattern where dependencies are injected into a class rather than created within the class.
• Dependency Injection helps in achieving loose coupling between classes.

• It allows for easier testing by enabling mocking of dependencies.

• There are different ways to implement Dependency Injection such as constructor injection, property injection, and method injection.

• Popular DI containers/frameworks
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Q5. Configuration where do we store in application.
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Configuration settings can be stored in various places such as appsettings.json, environment variables, database, or Azure Key Vault.
• appsettings.json file in ASP.NET Core projects

• Environment variables for sensitive data

• Database for dynamic configuration

• Azure Key Vault for secure storage
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Q1. Explain D in SOLID principle
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D stands for Dependency Inversion Principle in SOLID principle
• High-level modules should not depend on low-level modules. Both should depend on abstractions.

• Abstractions should not depend on details. Details should depend on abstractions.

• Example: Instead of directly calling a database connection in a class, use an interface to abstract the database connection.

• Example: Using dependency injection to inject dependencies in...read more
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Q2. Details about the projects I worked on
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Q1. What is Index in SQL ?
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An index in SQL is a data structure that improves the speed of data retrieval operations on a database table.
• Indexes are used to quickly locate data without having to search every row in a table.

• They can be created on one or more columns in a table.

• Examples of indexes include primary keys, unique constraints, and non-unique indexes.
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Q2. How you authenticate api
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API authentication can be done using various methods like OAuth, API keys, JWT tokens, etc.
• Use OAuth for secure authorization

• Implement API keys for simple authentication

• Utilize JWT tokens for stateless authentication

• Consider using HMAC for message integrity
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Q1. How we implement dependence injection ?
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Dependency injection is a design pattern where objects are passed their dependencies rather than creating them internally.
• Create an interface for the dependency

• Implement the interface in a separate class

• Pass the dependency to the class that needs it
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Coding round covers basic coding and also complex problems

Q1. What is an api?
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An API (Application Programming Interface) is a set of rules and protocols that allows different software applications to communicate with each other.
• APIs define the methods and data formats that applications can use to request and exchange information.

• APIs can be used to access web services, databases, or other external systems.

• Examples of APIs include Google Maps API for accessing map data, Twitter API for posting tw
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Q2. What are the response codes in api?
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Response codes in API indicate the status of a request made to the server.
• 200 - OK: Request was successful

• 400 - Bad Request: Request could not be understood by the server

• 404 - Not Found: Requested resource could not be found

• 500 - Internal Server Error: Server encountered an unexpected condition
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