Approach
Stabilize first, modernize with intent, then build what is missing.
A working system usually contains business knowledge that is not written down anywhere else. The first job is to preserve that knowledge while improving the code around it.
Diagnose
Understand the current code, hosting, dependencies, data flow, and business risks before changing the system.
Scope
Separate urgent fixes from nice-to-have improvements, then define a small delivery path with clear acceptance criteria.
Build
Make focused changes, keep deployment simple, and avoid introducing new moving parts without a clear benefit.
Stabilize
Test the critical paths, check logs, clean up fragile behaviour, and document what future maintenance needs to know.
Maintain
Keep the system updated, monitored, backed up, and ready for the next sensible improvement.