Azure Interview Questions – Cloud Computing Guide for .NET Developers

Azure is the cloud platform of choice for .NET developers. From hosting web apps to serverless functions and managed databases, understanding Azure services is essential for any modern .NET full-stack role. This guide covers the key Azure interview questions you should prepare for.

Why Azure Questions Are Asked in .NET Interviews

Most enterprise .NET applications are deployed on Azure. Interviewers want to know you can deploy, monitor, and scale applications in the cloud, and that you understand key services like App Service, Azure Functions, Azure SQL, and Azure DevOps.

1. What Is Microsoft Azure?

Microsoft Azure is a cloud computing platform offering IaaS (Infrastructure as a Service), PaaS (Platform as a Service), and SaaS (Software as a Service). It provides 200+ services including compute, storage, databases, AI, networking, and DevOps tools.

For .NET developers, Azure integrates seamlessly with Visual Studio, .NET SDKs, and Azure DevOps for CI/CD pipelines.

2. What Is Azure App Service?

Azure App Service is a fully managed PaaS for hosting web apps, REST APIs, and mobile backends. It supports .NET, Java, Node.js, Python, and PHP.

Key features include auto-scaling, custom domains and SSL, deployment slots for zero-downtime deployments, built-in authentication, and integration with Azure DevOps and GitHub Actions.

Interview Tip: Explain deployment slots — they allow you to deploy to a staging slot, test, and then swap with production for zero-downtime releases.

3. What Are Azure Functions?

Azure Functions is a serverless compute service that lets you run event-driven code without managing infrastructure. You pay only for the execution time.

[Function("ProcessOrder")]
public async Task Run(
    [QueueTrigger("orders")] string orderJson,
    FunctionContext context)
{
    var order = JsonSerializer.Deserialize<Order>(orderJson);
    await _orderService.ProcessAsync(order);
    _logger.LogInformation("Order {Id} processed", order.Id);
}

Common triggers include HTTP, Timer, Queue, Blob, Cosmos DB, and Event Grid. Azure Functions are ideal for background processing, scheduled tasks, and event-driven microservices.

4. What Is the Difference Between Azure SQL and Cosmos DB?

Azure SQL Database is a managed relational database service based on SQL Server. Best for structured data with complex relationships and ACID transactions.

Azure Cosmos DB is a globally distributed, multi-model NoSQL database. Best for high-throughput, low-latency scenarios with flexible schemas. It supports document, key-value, graph, and column-family models.

5. What Is Azure Blob Storage?

Azure Blob Storage is an object storage service for unstructured data like images, videos, documents, and backups. It offers three access tiers:

• Hot — Frequently accessed data (higher storage cost, lower access cost)
• Cool — Infrequently accessed data (lower storage cost, higher access cost)
• Archive — Rarely accessed data (lowest storage cost, highest access cost, hours to retrieve)

6. What Is Azure DevOps?

Azure DevOps is a suite of development tools including Azure Repos (Git), Azure Pipelines (CI/CD), Azure Boards (project management), Azure Test Plans, and Azure Artifacts (package management).

Azure Pipelines supports YAML-based pipelines that can build, test, and deploy .NET applications to any Azure service or external hosting.

7. What Is Azure Key Vault?

Azure Key Vault securely stores and manages secrets, encryption keys, and certificates. Instead of hardcoding connection strings or API keys in your application, you retrieve them from Key Vault at runtime.

builder.Configuration.AddAzureKeyVault(
    new Uri("https://myapp-vault.vault.azure.net/"),
    new DefaultAzureCredential());

Interview Tip: Never store secrets in appsettings.json or environment variables in production. Always use Key Vault or a similar secrets management service.

8. What Is Azure Service Bus?

Azure Service Bus is a fully managed enterprise message broker supporting queues (point-to-point) and topics/subscriptions (publish-subscribe). It is used for decoupling microservices, load leveling, and reliable message delivery.

9. What Are Managed Identities in Azure?

Managed Identities provide Azure services with an automatically managed identity in Azure AD. This eliminates the need to store credentials in code. There are two types: System-assigned (tied to a specific resource) and User-assigned (standalone identity that can be shared across resources).

10. What Is Azure Application Insights?

Application Insights is an APM (Application Performance Management) service for monitoring live applications. It tracks request rates, response times, failure rates, dependency calls, exceptions, and custom events. It integrates seamlessly with ASP.NET Core applications.

builder.Services.AddApplicationInsightsTelemetry();

Final Thoughts

Azure skills are increasingly important for .NET developers. Focus on App Service, Azure Functions, Azure SQL, and Azure DevOps as these are the most commonly tested in interviews. Hands-on experience with deploying real applications to Azure will give you a significant advantage.

Continue your interview preparation on Code Smarter. Learn Faster with our guides on C#, OOPS, .NET Core, SQL, Angular, and Web API.