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dotnet-interview-questions

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```markdown
# 🚀 ASP.NET Core Interview Questions with Practical Answers

Welcome to this curated collection of **75 technical questions** and answers about **ASP.NET Core**.  
This repository is designed to help developers prepare for interviews, deepen their backend knowledge, and master modern .NET application development.

---

## 📌 About This Repository

This project contains answers to common and advanced **.NET backend interview questions**, written in **Markdown**, with:

- ✅ Clear and concise explanations
- ✅ Real-world code examples in C#
- ✅ Structured by topic (Security, Middleware, Minimal APIs, etc.)
- ✅ Covers modern features in ASP.NET Core 8+

All questions have been answered and documented by **Albert Alarcón**, software developer passionate about .NET and backend architecture.

---

## 🧠 What You’ll Learn

- Middleware & Routing
- Authentication & JWT
- API Versioning & Swagger
- Clean Architecture & DDD
- Minimal APIs vs MVC
- EF Core & Data Access
- Caching & Rate Limiting
- Testing with Testcontainers
- CI/CD with GitHub Actions
- Performance & Observability

---

## 📚 Index

> Click to jump to each section

- [⚙️ Fundamentals & Middleware](#️-fundamentals--middleware)
- [🔐 Security](#-security)
- [🧩 Minimal APIs](#-minimal-apis)
- [🚀 Caching & Rate Limiting](#-caching--rate-limiting)
- [📦 API Versioning & Documentation](#-api-versioning--documentation)
- [🧱 Architecture & Design](#-architecture--design)
- [💾 Entity Framework Core](#-entity-framework-core)
- [⚙️ Performance and Optimization](#-performance-and-optimization)
- [🧪 Testing & CI/CD](#-testing--cicd)
- [🧑‍🔧 Miscellaneous](#-miscellaneous)

---

## ⚙️ Fundamentals & Middleware
- Routing, middleware order, types of middleware
- DI lifetimes (Singleton, Scoped, Transient)
- Background services and application lifecycle events

## 🔐 Security
- JWT, refresh tokens, anti-forgery
- IdentityServer overview
- Protecting endpoints and implementing permission-based auth

## 🧩 Minimal APIs
- Syntax and structure
- Comparison with traditional MVC
- DI and modular organization

## 🚀 Caching & Rate Limiting
- Output caching vs Memory/Distributed cache
- FusionCache, invalidation, and patterns
- Rate limiting strategies

## 📦 API Versioning & Documentation
- API versioning with or without URL changes
- Swagger/OpenAPI customization
- Annotating endpoints and models

## 🧱 Architecture & Design
- Clean Architecture, CQRS, Repository pattern
- Microservice design with ASP.NET Core
- MediatR and the Mediator pattern

## 💾 Entity Framework Core
- Migrations, seeding, concurrency
- Include/ThenInclude, AsNoTracking, multiple DbContexts

## ⚙️ Performance and Optimization
- Diagnosing slow APIs
- Response compression, `Span<T>`, `Memory<T>`
- `IAsyncEnumerable` for efficient streaming

## 🧪 Testing & CI/CD
- `HttpClient` mocking, JWT test strategies
- `WebApplicationFactory` for integration testing
- CI/CD pipelines using GitHub Actions and Azure DevOps
- Testcontainers for realistic database integration tests

## 🧑‍🔧 Miscellaneous
- Kestrel server and advanced hosting
- HttpContext.Items and scoped per-request data
- IHostedService, BackgroundService vs IAsyncDisposable

---

## ✍️ Author

> 👨‍💻 Developed and maintained by:

**Albert Alarcón Martínez**  
Software Developer – .NET, C#, Angular, Typescript  
📫 [GitHub Profile](https://github.com/aam9063)  
🌐 [Portfolio](https://codewithalbert.netlify.app)  
🔗 [LinkedIn](https://www.linkedin.com/in/albert-alarc%C3%B3n-mart%C3%ADnez-04044a51/)

---

## 📄 License

This repository is shared publicly for learning and professional growth.  
You’re welcome to fork, clone, or star this project. Attribution is appreciated.

```

---

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