I find this "segments" technique one of the most difficult things to do as a developer. Especially if it involves database or infrastructure but I love it as well :)
On of the best thing to do when it comes to refactoring a legacy product, is to add an abstraction layer in front of it and push the calls forwards (when it's an API).
If it's a full stack application it's much harder! It also depends on the language. A powerful IDE is your friend in most scenarios
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I find this "segments" technique one of the most difficult things to do as a developer. Especially if it involves database or infrastructure but I love it as well :)
On of the best thing to do when it comes to refactoring a legacy product, is to add an abstraction layer in front of it and push the calls forwards (when it's an API).
If it's a full stack application it's much harder! It also depends on the language. A powerful IDE is your friend in most scenarios