Most “hybrid cloud” case studies are really just migration stories. This one isn’t. A US-based physical security and fire systems integrator had 14+ subsidiary companies worth of data in AWS, thousands of field technicians in Azure Active Directory, and a board that wanted three distinct views of the same data - enforced by who the user was, not by which dashboard they clicked. Here is the architecture we stood up, the access pattern underneath it, and the two gotchas that will cost you a week if you replicate the stack without knowing about them. The full engagement is written up as a case study on the data-warehouse modernization we delivered for this integrator ; this post is the access-layer deep-dive for the practitioners. The starting point: one data estate, thousands of field workers, three audiences The customer is a security and fire systems integrator grown through acquisition - 14+ subsidiary operating companies spanning integration, security, and fire divisions.…