Quinnox Interview Questions and Answers

The project follows a layered architecture with separation of concerns, utilizing .NET Core for web APIs and data access.

• 1. Presentation Layer: Handles user interface and API endpoints, using ASP.NET Core MVC.

• 2. Business Logic Layer: Contains services that implement business rules, e.g., UserService for user management.

• 3. Data Access Layer: Interacts with the database using Entity Framework Core, e.g., Repository patte...read more

Azure App Service is for hosting web apps, while Azure Functions is for serverless computing and event-driven applications.

• Azure App Service is designed for hosting web applications, REST APIs, and mobile backends.

• Azure Functions is a serverless compute service that runs code in response to events or triggers.

• App Service supports various frameworks like .NET, Node.js, PHP, and Python, while Functions can run code in mu...read more

Custom middleware in .NET Core enhances request processing, logging, and error handling for specific scenarios.

• Used for logging requests and responses to monitor application performance.

• Implemented authentication middleware to validate user tokens before accessing protected routes.

• Created custom error handling middleware to catch exceptions and return standardized error responses.

• Utilized middleware for CORS (Cross-Ori...read more

Custom middleware in .NET Core 8 can be registered using the new minimal hosting model without a startup file.

• Use the 'WebApplication' class to create the application instance.

• Define middleware using the 'app.Use' methods, e.g., 'app.Use(async (context, next) => { ... });'.

• Middleware can be registered in the order they should be executed.

• Example: 'var app = WebApplication.Create(args); app.UseRouting(); app.UseAutho...read more

Dependency Injection (DI) types include Constructor, Property, and Method Injection, each suited for different scenarios.

• Constructor Injection: Dependencies are provided through class constructors. Use when dependencies are required for object creation.

• Example: public MyClass(IDependency dep) { ... }

• Property Injection: Dependencies are set through public properties. Use when dependencies are optional or can change over...read more

Common code for handling 500 errors can be placed in middleware or global exception handling in .NET Core applications.

• Use custom middleware to catch exceptions globally and log them.

• Implement the 'UseExceptionHandler' method in 'Startup.cs' to define a centralized error handling route.

• Utilize 'IApplicationBuilder' to configure error handling in the request pipeline.

• Create a global exception filter to handle exceptions...read more

A schema defines the structure of a database, including tables, fields, and relationships. Yes, databases can share schemas.

• A schema is a blueprint of how data is organized in a database.

• It includes definitions of tables, columns, data types, and relationships.

• For example, a 'User' table might have columns like 'UserID', 'Name', and 'Email'.

• Two databases can share the same schema if they have identical structures but m...read more

Stored procedures perform actions, while functions return values and can be used in expressions.

• Stored procedures can perform operations like INSERT, UPDATE, DELETE, while functions are typically used for calculations.

• Functions must return a value, whereas stored procedures do not have to return anything.

• Stored procedures can have input and output parameters, while functions can only have input parameters.

• Example of a ...read more

Yes, we can pass a list of objects to a database using Entity Framework or ADO.NET in .NET Core.

• Use Entity Framework Core to map your objects to database tables.

• Example: dbContext.AddRange(listOfObjects);

• Use ADO.NET with SqlCommand for bulk inserts.

• Example: SqlBulkCopy for efficient bulk data transfer.

Clustered indexes store data rows in sorted order, while non-clustered indexes maintain a separate structure for quick lookups.

• Clustered indexes determine the physical order of data in a table.

• A table can have only one clustered index, as data rows can be sorted in only one way.

• Non-clustered indexes create a separate structure that points to the data rows, allowing multiple non-clustered indexes per table.

• Example: A cl...read more

WebMethods architecture involves integration, process automation, and service-oriented architecture for enterprise applications.

• WebMethods provides a suite of tools for integrating various applications and data sources.

• It supports service-oriented architecture (SOA) principles, allowing for reusable services.

• Example: Using webMethods Integration Server to connect SAP and Salesforce for seamless data flow.

• It includes fe...read more

AWS Layers are a way to centrally manage code and data that is shared across multiple functions in AWS Lambda.

• AWS Layers allow you to separate out common code or dependencies from your Lambda functions.

• You can create layers with libraries, custom runtimes, or other dependencies that can be reused across multiple functions.

• Layers can be versioned and shared across multiple functions in the same AWS account.

AWS queues are messaging services that decouple components of a cloud application.

• Amazon SQS (Simple Queue Service) - fully managed message queuing service

• Amazon SNS (Simple Notification Service) - pub/sub messaging service

• Amazon MQ - managed message broker service

• Amazon Kinesis - real-time data streaming service

MySql is a relational database management system while NoSql is a non-relational database management system.

• MySql is table-based and uses structured query language (SQL) for querying data.

• NoSql is document-based, key-value pairs, wide-column, or graph-based and does not require a fixed schema.

• MySql is suitable for complex queries and transactions, while NoSql is better for large amounts of unstructured data and horizon...read more