Refactoring a 500-Line Method with the Pipeline Pattern

A walkthrough of refactoring a bloated 500-line method full of chained if-else business rules into a clean pipeline pattern. Using a loan eligibility service as the example, the approach extracts each business rule into its own class implementing an IEligibilityRule interface with an order property. An EligibilityPipeline class then executes the rules in order, passing a shared context object through each step and allowing early termination on rejection. The result is individually testable rules, easy addition of new rules via dependency injection registration, and a pipeline that respects the open-closed principle.