Uber reportedly has 19 custom internal AI-related systems

A writer previewing a case study says Uber has 19 custom internal AI-related systems, many of which predate AI. One example is a PRD+ERD system documenting connections among roughly 5,000 internal systems. The writer argues that agentic AI at mid-sized and larger companies needs complex supporting systems because there is so much context to handle and limited space in AI context windows.