Architecture · June 12, 2026
Strangler patterns that do not strand your data
Author: Jordan Reyes, Chief Architect
Modernization programs fail when the new service owns the happy path but the database remains a shared monolith. Here is how Solvibz sequences stranglers so product keeps shipping.
Why stranglers fail
Teams extract an API, leave writes in the legacy store, and hope dual reads stay consistent. Without an ownership map, every feature becomes a negotiation.
Data coexistence
Expand / contract schemas
Add new columns or collections first, dual-write, backfill, then cut reads—never the reverse.
Event bridges
Use change data capture when the legacy core cannot emit domain events cleanly.
Cutover checklist
- Parity tests on critical flows
- Feature flags with instant rollback
- Runbooks for reconciliation jobs
- Customer communication for edge cases
Metrics that matter
Track dual-write lag, reconciliation exceptions, and error budgets—not just “services migrated.”