The CAKEstack introduces a novel approach to building fully stateful serverless applications by combining CockroachDB Serverless, advanced authentication and authorization platforms, Kubernetes, and event-driven serverless platforms. CockroachDB Serverless provides a scalable database solution capable of "scaling to zero," allowing applications to automatically adjust to workload demands and only charge for consumed compute resources. The stack emphasizes modularity, offering flexibility in choosing components like authentication platforms and serverless frameworks. This architecture supports seamless scaling from an MVP to full-scale operations without requiring extensive upfront infrastructure investment, enabling businesses to accommodate fluctuating workloads efficiently. By leveraging the CAKEstack, developers can focus on user acquisition and application performance, avoiding technical debt and excessive provisioning costs associated with traditional architectures.