Total system rewrites have a well-documented history of failure: timelines stretch, budgets expand, and existing business rules accumulated over years are lost in translation.
Incremental modernization decouples high-value bounded contexts from the legacy system one at a time. By routing traffic through an intelligent API proxy and validating responses against shadow runs, risk is managed mathematically.
This approach delivers working modernized modules to production every few weeks rather than asking stakeholders to wait months for a high-risk 'big bang' launch.