Cognizant Senior Software Developer Interview Questions, Process, and Tips

Q1. Mvc arch & life cycle and basic oops & experianced based
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Q2. All sql practical questions
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Q1. IEnumerable vs IQueryable
Ans. 
IEnumerable is for in-memory collections, while IQueryable is for querying data from external sources like databases.
• IEnumerable executes queries in memory, suitable for collections like arrays or lists.

• IQueryable allows for deferred execution and can translate queries to SQL for databases.

• Example: IEnumerable can be used with List<T>, while IQueryable is used with Entity Framework for database queries.

• IQueryable...read more
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Q2. Middleware, Use, Run and Map functions
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Questions regarding Java 8, Spring Boot, and Microservices were asked.

Q1. NA - Not Available
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Q2. Was selected for the 2nd Round as per the communication from them but they never got back or scheduled the second round after that.
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Q1. What is entity framework
Ans. 
Entity Framework is an ORM (Object-Relational Mapping) framework for .NET applications.
• ORM framework for .NET applications

• Maps database tables to classes in code

• Provides a way to query and manipulate data using LINQ

• Supports various database providers such as SQL Server, MySQL, etc.
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Q2. What is CTE in SQL
Ans. 
CTE stands for Common Table Expression in SQL, used to create temporary result sets that can be referenced within a query.
• CTEs are defined using the WITH keyword

• They can be recursive or non-recursive

• CTEs improve readability and maintainability of complex queries

• Example: WITH cte AS (SELECT * FROM table_name) SELECT * FROM cte
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Q1. What are solid principles
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SOLID principles are a set of five design principles for writing maintainable and scalable object-oriented 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 affectin...read more
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Q2. What are design patterns
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Design patterns are reusable solutions to common problems in software design.
• Design patterns provide a template for solving recurring design problems in software development.

• They help in making code more maintainable, scalable, and efficient.

• Examples include Singleton, Factory, Observer, and Strategy patterns.
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Q1. Why you would like to join company
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Q2. Why shouild we select you
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