T-Systems ICT India Senior Software Engineer Interview Questions and Answers

SOLID is a set of five design principles for writing maintainable and scalable object-oriented software.

• Single Responsibility Principle (SRP) - A class should have only one reason to change.

• Open/Closed Principle (OCP) - Software entities 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 affe...read more

OOPs (Object-Oriented Programming) is a programming paradigm based on the concept of objects, which can contain data and code.

• Encapsulation: Bundling data and methods that operate on the data into a single unit (object)

• Inheritance: Ability for a class to inherit properties and behavior from another class

• Polymorphism: Ability for objects of different classes to respond to the same message in different ways

• Abstraction: H...read more

The .Net framework is a software development platform developed by Microsoft, providing a wide range of tools and libraries for building various types of applications.

• Common Language Runtime (CLR) - manages memory, security, and execution of code

• Base Class Library (BCL) - provides a set of reusable classes for common programming tasks

• ASP.NET - framework for building web applications

• Windows Presentation Foundation (WPF)...read more

Indexes are used to improve database performance. Clustered indexes determine the physical order of data, while non-clustered indexes do not.

• Indexes are used to speed up data retrieval operations in a database.

• Clustered indexes determine the physical order of data in a table, while non-clustered indexes do not.

• A table can have only one clustered index, but multiple non-clustered indexes.

• Clustered indexes are generally ...read more

Query to delete duplicate rows from a table

• Use GROUP BY clause to group the rows by their unique values

• Use HAVING clause to filter out the groups with count greater than 1

• Use DELETE statement to delete the duplicate rows

Singleton pattern restricts the instantiation of a class to a single instance and provides a global point of access to it.

• Create a private constructor to restrict instantiation of the class

• Create a private static instance of the class

• Create a public static method to access the instance

• Ensure thread safety if necessary

• Examples: Database connection, Logger, Configuration settings

Handle exceptions in stored procedures by using TRY-CATCH blocks.

• Use TRY-CATCH blocks to catch and handle exceptions

• Log the error message and severity level

• Rollback the transaction if necessary

• Rethrow the error if it cannot be handled

• Use RAISERROR to raise custom error messages

SOLID principles are a set of five design principles that help in creating maintainable and scalable software.

• S - Single Responsibility Principle: A class should have only one reason to change.

• O - Open-Closed Principle: Software entities should be open for extension but closed for modification.

• L - Liskov Substitution Principle: Subtypes should be substitutable for their base types.

• I - Interface Segregation Principle: C...read more

throw is used to throw an exception while throw exception is used to throw a specific exception.

• throw is used to throw any type of exception while throw exception is used to throw a specific type of exception.

• throw exception is followed by the type of exception that needs to be thrown.

• throw can be used to throw any object while throw exception can only be used to throw an exception object.

• Example: throw new Exception("

Hoisting is a JavaScript behavior where variable and function declarations are moved to the top of their containing scope during compilation.

• Variable and function declarations are hoisted to the top of their scope.

• Only declarations are hoisted, not initializations.

• Function declarations take precedence over variable declarations.

let and const are block-scoped while var is function-scoped. const cannot be reassigned, let and var can.

• let and const are block-scoped, var is function-scoped

• const cannot be reassigned, let and var can be

• var can be hoisted, let and const cannot

The role and responsibility of a Senior Software Engineer is to design, develop, and maintain software applications, lead a team of developers, and ensure the quality and efficiency of the software development process.

• Designing and developing software applications

• Leading a team of developers

• Ensuring the quality and efficiency of the software development process

• Collaborating with stakeholders to gather requirements and ...read more