JR.

Justin Rhinesmith

I build the parts of
software you don't see.

I'm a founding engineer with twenty years spent building and scaling backend systems. These days that means the infrastructure underneath production AI — document ingestion, schema-constrained extraction, agentic workflows, model routing, and the evaluation, tooling, and CI that get all of it safely into customers' hands.

Currently the first engineer at Boon, the intelligence layer for construction. Before that, DoorDash, Square, and a handful of startups. Based in Walnut Creek, California.

Elsewhere