SAGE Inspection

Certifying an LPG installation meant sending a qualified engineer to the site. Nine existing platforms, commercial and open source, were evaluated and none combined live video, multi-technician management, an engineer console, and a self-hosted regulated checklist.

A custom build splitting hot media from durable transactions. SFU topology so the phone encodes once. Inspection modelled as a state machine with an append-only audit log, not CRUD. Five phases, each with a written exit criterion and no phase built ahead of the one below it.

Technician-to-engineer streaming proven on real hardware, the inspection workflow at roughly ninety-five percent, and an evidence chain of custody the database enforces rather than the application layer.