Jeff Bezos's Internal Mandate

Jeff Bezos issued a famous company-wide mandate stating that all teams must expose their data and functionality through service interfaces, using only APIs for communication, forbidding direct access to each other's data stores.

Significance

This mandate fundamentally re-architected Amazon's internal systems into a service-oriented architecture, inadvertently creating the modular, scalable components that would later become AWS services and fostering an API-first culture.