Legacy-code maintenance
Problem
In legacy code, a small change can depend on implicit rules, old integrations, or undocumented flows.
Analysis
Before editing, I identify the affected flow, entry points, dependencies, and how to check that current behavior remains unchanged. Understanding the system is part of the work.
Solution
I prefer small changes, clear names, and the manual or automated checks that are available. When possible, I document decisions that reduce future uncertainty.
Validation
I check the case that motivated the change and review nearby flows, especially those that share data, queries, or business logic.
Result or learning
Learning: improving legacy code starts by reducing risk and understanding the system better, not simply by rewriting it.