What's the most ambitious thing you can vibe-code? Spencer decided to find out by building N# - a working .NET programming language, complete with compiler, tooling, and language server support - entirely with AI coding agents.

In this session, Spencer will take you through the full journey: from initial language design prompts to a functioning compiler that targets .NET. We'll go over how to structure truly ambitious AI-assisted projects, when to let the AI run vs. when to take the wheel, and what breaks when you push these tools to their absolute limits.

This isn't just a flex - it's the most extreme stress-test of AI coding tools you'll ever see, and every lesson transfers to your own projects.