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An architectural approach for running legacy systems alongside new components and enabling incremental modernization.
Coexistence Architecture defines strategies for running legacy systems alongside new cloud‑native components. It emphasizes interface layers, decoupling, data consistency and phased migration so operations and development can coexist. The goal is to reduce risk, enable continuous delivery and achieve incremental modernization without full replacement.
Average time to move a feature from the legacy system into the new architecture.
Count and severity of incidents involving inconsistent data states.
Monthly cost for running legacy and new components in parallel.
An online shop incrementally extracts checkout functionality into new services while the old shop remains running.
Critical ERP modules remain on‑premise while analytics run in the cloud with synchronized interfaces.
Event‑based replication provides near‑real‑time consistency between the legacy system and new microservices.
Analyze: create interface inventory and dependency map
Design: define integration layer and migration paths
Pilot: extract a small domain and implement monitoring
Iterate: capture lessons learned and expand incrementally