Cognizant Senior Software Developer Interview Questions, Process, and Tips for Experienced

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
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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
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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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Q1. React js useMemo useCallback difference
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useMemo is used to memoize the result of a function, while useCallback is used to memoize a function itself.
• useMemo is used to optimize expensive calculations by caching the result and returning it when the dependencies don't change.

• useCallback is used to optimize the performance of child components by preventing unnecessary re-renders when the dependencies don't change.

• Both useMemo and useCallback accept a dependency ...read more
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Q2. React js useEffect usecase
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