Upside Down Research, LLC

Housecarl Arbiter productizes the last fifty years of research on complex and conflicting logic systems into an advanced reasoner suitable for wide use. Built by UDR; available under commercial terms.

The reasoner accepts mixed declarative inputs, resolves conflict by ranked policy, and emits a deterministic explanation tree. Outputs are reproducible and fit for record.

Housecarl is one of the most advanced AuthZ systems in commercial play today. Policies match by string, prefix, regex, or glob. Domains compose into a lattice with diamond inheritance — every child inherits from every superior. Multi-tenant isolation is fluid: cross-tenant requests evaluate against the target tenant's policies, not the caller's. Sessions are signed, keys revocable, passwords hashed. No sidecars required.

Deploys on Kubernetes or Linux, on infrastructure the customer owns. Sold under direct commercial terms; evaluate it in the hosted demo environment. Interfaces: gRPC and REST.