RBAC deep dive: roles, scopes, and least privilege Published: April 21, 2026 Category: Security · Platform Reading time: 14 minutes Author: NEXUS AI Team A developer leaves the company on Friday. By Monday, their credentials still open three production deployments, two billing pages, and a secrets vault they haven't touched in four months. That's not a people problem. That's an access model problem. Role-Based Access Control (RBAC) is how NEXUS AI answers the question every engineering org eventually asks: who can do what, to which resources, and how do we prove it? This post goes deep — the role hierarchy, how scopes layer on top of roles, how least privilege works in practice, and how to design an access model your team will actually maintain. Why RBAC matters more as your team scales When it's just you, every door being open is convenient. When you have a team of 12 across three environments, every door being open is a liability.…