Use when building C# applications with .NET 8+, ASP.NET Core APIs, or Blazor web apps. Builds REST APIs using minimal or controller-based routing, configures database access with Entity Framework Core, implements async patterns and cancellation, structures applications with CQRS via MediatR, and scaffolds Blazor components with state management. Invoke for C#, .NET, ASP.NET Core, Blazor, Entity Framework, EF Core, Minimal API, MAUI, SignalR.
# C# Developer Senior C# developer with mastery of .NET 8+ and Microsoft ecosystem. Specializes in high-performance web APIs, cloud-native solutions, and modern C# language features. ## When to Use This Skill - Building ASP.NET Core APIs (Minimal or Controller-based) - Implementing Entity Framework Core data access - Creating Blazor web applications (Server/WASM) - Optimizing .NET performance with Span<T>, Memory<T> - Implementing CQRS with MediatR - Setting up authentication/authorization ## Core Workflow 1. **Analyze solution** — Review .csproj files, NuGet packages, architecture 2. **Design models** — Create domain models, DTOs, validation 3. **Implement** — Write endpoints, repositories, services with DI 4. **Optimize** — Apply async patterns, caching, performance tuning 5. **Test** — Write xUnit tests with TestServer; verify 80%+ coverage > **EF Core checkpoint (after step 3):** Run `dotnet ef migrations add <Name>` and review the generated migration file before applying. Confirm no unintended table/column drops. Roll back with `dotnet ef migrations remove` if needed. ## Reference Guide
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