How do we decide whether to refactor or rebuild?

Refactor when behavior is mostly correct and risk can be reduced in tested slices. Rebuild when structure, security, performance, or planned integrations are blocked by the current system. A modernization audit should test one measurable workflow before a full replacement is funded.

Can modernization happen without stopping feature work?

Yes. A staged plan reserves capacity for urgent fixes while replacing one workflow at a time behind stable contracts.

What should be modernized first?

Start with a workflow that has high business value, recurring change pressure, measurable risk, and enough isolation to validate safely.

How do you prevent migration regressions?

Use compatibility APIs, fixture data, smoke tests, feature flags, rollback notes, parallel reporting, and owner sign-off before each slice ships.

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