Chapter 16: Legacy Modernization: When and How to Evolve What Already Exists

Most architecture is not greenfield. This chapter covers the strangler fig pattern, incremental migration strategies, the decision between rewrite and evolve, and how to modernize without breaking the systems the business depends on.

What this chapter covers

Strangler fig pattern for incremental migration
Big bang rewrite vs. incremental modernization
API-led connectivity for legacy integration
Database modernization strategies
Technical debt assessment and prioritization
Feature flags for safe migration
Managing risk during legacy modernization
Building the business case for modernization

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