Design across the full stack: multi-tenant SaaS, identity & SSO (SAML/OIDC/SCIM), data residency, integration patterns (REST/GraphQL/event-driven), Forge & Connect app strategy, Marketplace ecosystem, and migration paths (Server/DC Cloud, Cloud-to-Cloud). The FDA is the architect in the room - the person who turns a CIO's ambiguous "modernize how we work" into a credible, phased, AI-native architecture and the business transformation plan that makes it stick across HR, Finance, Marketing, PMO, Operations, and Engineering.