Your question is Modularization in Monoliths. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
How do you approach modularization in a monolithic codebase?
Describe a practical plan for identifying module boundaries, separating responsibilities, managing dependencies, and migrating incrementally without disrupting existing functionality. Include how you would preserve testability and evaluate whether the modularization improved maintainability.