Legacy modernization without freezing delivery

If the business depends on the product, asking for a complete freeze usually pushes the cost to sales, support, and internal trust. The solution has to coexist with delivery.

A useful unit combines affected route, clear ownership, exit criteria, and tests. It is not an abstract module, it is a concrete part of the system that leaves less risk once completed.

Before moving twenty pieces, move one and prove that the team can repeat the process without breaking compatibility, deployment times, or support.