This paper presents a Server-Driven UI (SDUI) architectural framework designed and deployed within a large-scale cryptocurrency trading platform serving over two million active users in North America. By decoupling user interface logic from the application binary, the framework enables compliance-related interface updates — including disclosure screens, jurisdiction-specific onboarding flows, and regulatory acknowledgment prompts — to be deployed in near-real time without requiring a new application release. Results demonstrate a reduction in time-to-compliance from ten to fourteen days under the legacy model to under thirty minutes using SDUI, with direct implications for platforms operating under the GENIUS Act and FinCEN AML/BSA guidelines. This work contributes a replicable architectural model for fintech platforms navigating evolving regulatory requirements.