Data residency requirements and regional compliance laws such as GDPR or LGPD often force architectures to fragment data across multiple cloud providers and geographic boundaries. When a centralized database becomes a legal or performance bottleneck, engineering teams frequently resort to manual data duplication or brittle synchronization scripts. This fragmentation leads to inconsistent state, increased latency for cross-border users, and a massive expansion of the security attack surface. The definitive solution to this complexity is a Multicloud Data Sharding layer orchestrated through Hexagonal Architecture. By decoupling the domain entity from the underlying storage mechanism, we allow the application to route queries to specific cloud-native databases based on tenant metadata.…