Szymon Kulec is a Polish .NET engineer (Microsoft MVP) and one of the contributors to the Async Expert course on advanced .NET asynchronous programming, alongside Konrad Kokosa and Łukasz Pyrzyk on the Dotnetos training platform.
His CourseFlix listing carries Async Expert — a deep dive into the async/await model in .NET, covering the synchronisation context, ConfigureAwait, the thread-pool interactions, and the production-debugging patterns for async-heavy code.
Material is paid and aimed at senior .NET developers working on performance-critical applications where the async model needs to be understood at the level of the runtime rather than the language surface.