Gremlin's role-based access control (RBAC) system enhances security and efficiency in reliability testing and chaos engineering by allowing organizations to customize user privileges. This system enables Gremlin customers to specify which actions users can perform, thereby minimizing risks associated with running tests on systems. Gremlin offers default roles, divided into Company roles for managing a Gremlin company and Team roles for actions within a Gremlin team, which can be customized further to meet specific organizational needs. The principle of least privilege guides this security model, ensuring users only receive the necessary permissions to perform their tasks. Organizations can set default roles at both company and team levels, and these roles can be overridden on a team-by-team basis. While users can create custom roles, pre-existing default roles remain available for those who prefer not to configure their own. Gremlin's automated reliability platform aims to help users identify and address system vulnerabilities before they affect end users, with a customizable RBAC as a part of this offering.