F# Web API (F#, ASP.NET Core, PostgreSQL, Docker, .NET) overview

A functional-first web API built with F# on the ASP.NET Core runtime, combining the expressiveness of ML-family type systems with the mature .NET ecosystem. F# discriminated unions and computation expressions model domain logic precisely, while ASP.NET Core handles HTTP routing, middleware, and dependency injection. Entity Framework Core provides PostgreSQL access with LINQ query composition. Serilog captures structured logging, and xUnit with FsCheck enables property-based testing. Docker containers target the .NET runtime for deployment. The tradeoff is that F# is less popular than C# in the .NET world, meaning fewer examples and some interop friction with C#-first libraries.