Technology

A two-pronged approach is required here. First, you must identify what different features of the application's base framework are being utilized. The differentiation could be, for example, implemented on the basis of heavy dependency on certain data structures, interprocess communication being performed, or the activity of report generation. This is the easier part.

However, as the second step, I recommend that you become more confident and pick up pieces that use a type of technology that is different from what is being used currently. For example, there could be a piece of code relying on simple data structures or XML-based persistence. Identify such baggage in the system and mark it for a transition. A lot of prudence is required in this twin-pronged approach. Making a selection that is too ambitious could set you on a path similar to what we have been trying to avoid altogether.

Some of these parts might not look like very promising candidates for the final microservice-style architecture application. They should still be dealt with now. In the end, they will allow you to easily perform the transition.