ZweiTürmeSystem

ZweiTürmeSystem, also referred to as the Two-Tower System, is a software architecture pattern designed to separate user interaction from business logic and data management by organizing the system into two distinct towers. Tower A, the presentation tower, hosts the user interface, authentication, localization, and client-side state management. Tower B, the core tower, contains the business logic, data access layer, and persistent storage, along with APIs for external consumption. The two towers communicate through defined interfaces, typically over a network via REST, GraphQL, or gRPC, and may employ asynchronous messaging for events.

By separating concerns, the ZweiTürmeSystem enables independent scaling, security zoning, and simpler compliance auditing, since access control can be enforced at the presentation layer and data handling at the core. Some implementations include additional cross-cutting layers such as an API gateway, a caching layer, or an edge compute component.

Deployment is often containerized with Kubernetes, enabling independent rollout of front-end and back-end components, and supporting cloud and on-premises environments. Suitable use cases include enterprise applications, software as a service platforms with multi-tenant models, and data-intensive applications where user interface responsiveness and back-end processing are both critical.

Challenges include potential latency between towers, data consistency issues, and increased operational complexity; these require careful design of data models, transactional boundaries, and comprehensive monitoring. The concept emerges from the broader family of two-tier and microservice architectures, with terminology and implementations varying across organizations. The term ZweiTürmeSystem is a stylistic designation used in German-language documentation and research.