Hi! My name is Einar W. Høst. I am a Norwegian software developer and architect.

I write a blog and do talks at conferences. I’m interested in domain-driven design, collaborative modelling, API design, and the Web. I have a Ph.D. in Computer Science.

I enjoy Advent of Code. I have made some visualizations.

I like whimsical hobby projects. Some examples include Hypercat, a concatenative programming language that uses the URL as a stack of values, Hyperpictures, a hypermedia-driven tool for composing pictures, and Hyperwolf, a hypermedia adaptation of the game “Werewolves and Wanderer”.

You can find me on Mastodon and BlueSky, even LinkedIn.

Latest blog posts

• 2025-08-25

  Nullable vs nullable in C#
  In C#, nullable means something very different for reference types and value types, but the syntax is the same for both. That's bound to lead to problems.

• 2025-08-15

  Disentangling intertwingled magicks in ASP.NET Core Web APIs
  The typical ASP.NET Core Web API relies heavily on at least two kinds of "magick": model binding and generation of OpenAPI documents. They are joined at the hip through C# type declarations, which are the sources of OpenAPI schemas and the targets of model binding. In this blog post, I take a look at the gotchas and caveats and shortcomings of this arrangement.

• 2025-06-20

  Book heuristics
  You can't read every book. Which ones can you safely ignore? This blog post contains a handful of heuristics for dodging boring books and finding something interesting to read.