Solution pattern
Legacy Application Modernization
A phased plan for stabilizing, improving, or selectively replacing an important older application.
The problem
A critical older application is difficult to change, expensive to maintain, or exposed to operational and security risk.
Approach
- Establish a documented baseline before changing behavior
- Improve dependencies, security, and deployment in small batches
- Extract high-risk components behind clean interfaces and replace selectively
Illustrative scenario
one workflow is moved from an older application while other functions remain in place. Map the shared data and dependencies before separating that workflow. Define how new records are reconciled during transition and what conditions stop the release. This pattern does not assume that every database change can be rolled back safely.
Related service: application modernization.
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