Markus Schwer developed a custom role resource and data source for the stackitcloud/terraform-provider-stackit repository, focusing on enhancing authorization and access control. By leveraging Go, Terraform, and API integration skills, Markus enabled users to define and manage custom roles with specific permissions, addressing the need for fine-grained RBAC within cloud environments. The implementation introduced primitives for scalable governance and streamlined permission management, reducing reliance on ad-hoc access controls. Markus collaborated closely with other engineers to ensure code quality and cross-team alignment, delivering a robust foundation for future access-control enhancements and improving visibility and compliance through dedicated data source capabilities.