I make things and write down how it went.

Thirty-odd manufacturers, all publishing specs as PDFs, none of them agreeing on a format. This turns them into one searchable schema.

Inventory for people with too many small parts. Every bin tracked, searchable, and readable by an API so I stop buying my third of everything.

Three nodes in a closet running most of what I'd otherwise rent, and where I break things on purpose to see how they fail.