Joseph Demarest

My day job is founding engineer at Vyir, an optics R&D company, where I work across the whole instrument: the optics, the electronics, the firmware and the software on top. The work stays at work, so this site is about everything else.

Outside of it I build things mostly to find out how they work. Lately that means a space game that keeps changing shape, a Minecraft mod with see-through portals, a fruit-fly brain running on my own hardware, and a pile of tooling that keeps AI coding agents honest about what they cost. A lot of the code these days is written alongside those agents, which is why so much of the tooling is about watching them. Most of it lives in private repositories. Where something is public, I've linked it.