Principle one
Design around durable organizational concepts.
Applications change more quickly than the core concepts of the enterprise. Architecture should begin with stable identities, responsibilities, records, relationships, policies, and events—not the limitations of a particular tool.
Principle two
Separate capabilities without separating context.
Modular systems are easier to evolve, but fragmentation returns when every module creates its own meaning, identity, and controls. Shared contracts and governed context allow capabilities to remain independent and coherent.
Stable service boundaries
Shared identity and policy
Explicit data ownership
Principle three
Treat trust as a system quality.
Security, privacy, resilience, observability, and auditability must be architectural properties. They cannot depend on a final compliance review or isolated controls at the edge.
Least-privilege access
Encryption and isolation
Observable, recoverable operations
Principle four
Build for controlled evolution.
The architecture should make change safe. Versioned contracts, automated testing, clear dependencies, migration paths, and disciplined delivery allow the enterprise to evolve without destabilizing critical operations.