AsyncSpark Technical Summary AsyncSpark is a production-ready reference implementation demonstrating enterprise-grade async/await patterns in .NET 10, built by Mark Hazleton as part of the Make Bold Spark portfolio. The project showcases eight core async patterns including ConfigureAwait(false) usage, CancellationToken threading, Task.WhenAll parallelization, SemaphoreSlim throttling, Polly resilience policies, decorator pattern implementation, fire-and-forget safety, and elimination of blocking calls—each with accompanying unit tests and live API demonstrations. The repository implements constitution-driven development, a formalized governance approach that enforces architectural standards through automated compliance auditing, 80% code coverage requirements in CI/CD pipelines, and interactive pull request reviews. Built on modern .NET 10 features (nullable reference types, implicit usings, file-scoped namespaces, primary constructors), the codebase is organized into a modular structure spanning core async utilities, an ASP.NET Core web application with interactive Scalar-powered API documentation, weather service integrations, comprehensive test suites using MSTest and Moq, and console demonstrations. The project is distinguished by its clean architecture principles—dependency injection, interface-based design, and decorator pattern for cross-cutting concerns—combined with resilience patterns via WebSpark.HttpClientUtility and structured logging with ILogger<T>. AsyncSpark targets intermediate-to-advanced .NET developers and architects seeking production-ready patterns and best practices, offering both conceptual learning through well-documented code examples and practical experience via a live web application deployed to Azure with real OpenWeatherMap API integration, comprehensive health checks, and an interactive API explorer supporting dark/light modes and live request testing.