A Claude or Codex skill for deliberate skill development during AI-assisted coding

Testing layer for Microsoft's HttpClient library. Create canned responses using a fluent API.

A powerful MCP toolkit for coding, providing semantic retrieval and editing capabilities - the IDE for your agent

Advent of Code Solutions by AE employees

Random Testing for .NET

Awesome online talks and screencasts

Legacy Code Retreat - Trivia Game codebase

An experiment in publishing code and words about code on a small scale.

A Refactoring Golf exercise

RxJS Koans

A kata on RxJS that should get you up to speed with test schedulers, among other things...

Workshop: Functional geometry with Escher and Elm.

Tag input field for multiple tag types. To be used as embedded Elm component.

My list of code katas

get feedback on your unit tests

Advent of Code 2017

Categorized overview of programming principles & design patterns

A .NET library for carefully refactoring critical paths. It's a port of GitHub's Ruby Scientist library

The paperboy example used for illustrating the anemic domain model

Code base for live coding demo or coding dojo on legacy code refactoring

Information about the topics for each week of the course - published week by week.

A simple example of a solution using domain, contracts, ports and adaptors. In collaboration with Daniel Portella.

TDD with Mock Objects: Design Principles and Emergent Properties (C#, JavaScript, Java, Python, Ruby)

ApprovalTest verification library for .Net