Software Engineer · Educator · Builder

Aaron Castelyn

30 years building software. Now teaching NPCs to think.

I'm an enterprise software engineer with nearly three decades of experience building systems for financial institutions. The kind that have to work at scale, under real constraints, with real consequences. That's still my day job.

On the side, I run Mindplay with Aaron, a YouTube channel where I apply that same engineering mindset to a different kind of problem: making game characters that actually think. Reinforcement learning, local LLMs, behaviour systems in Unreal Engine 5. I script, film, edit, and produce everything myself.

The workshops are the hands-on extension of that. Small, focused, live sessions where you build something real and leave with working code. No fluff, no hand-waving.