Microservices can quickly turn from a promising architecture into a chaotic mess. While they offer benefits like small, independent components and clear interfaces, teams often find themselves grappling with complex dependencies and hard-to-trace failures. The author suggests that to maintain order, microservices should be structured as a polytree — a directed acyclic graph where the underlying structure is a tree. This strict framework helps teams avoid the pitfalls of tangled dependencies that can arise from poorly defined relationships between services. The article identifies two main issues that can derail microservice architecture: directed cycles and undirected cycles. Directed cycles create confusion over state ownership, making debugging difficult and leading to cascading failures. Undirected cycles, while lacking a direct circular dependency, still introduce complications by obscuring the flow of responsibility and making scaling and fault tolerance more challenging. The recommended fixes involve simplifying the architecture by merging services or rearranging functionality to eliminate these cycles. Using a polytree structure can lead to clearer ownership of data, predictable failure modes, and easier onboarding for new engineers. Each service has a defined position within the hierarchy, allowing for straightforward navigation from the leaves to the root. This structure minimizes the risk of unexpected breakage during updates and redeployments. The clean mathematical properties of polytrees—no cycles, unique paths, and guaranteed termination—enhance operational clarity and facilitate independent evolution of system components.