Alex contributed to the apache/nifi repository by addressing a UI layering issue that affected the bring-to-front behavior of elements within the application. Using Angular, TypeScript, and RxJS, Alex implemented logic to ensure that newly created connections and labels are always assigned a z-index higher than the current maximum, guaranteeing consistent front placement. This work also stabilized FlowEffects tests, reducing flakiness and improving reliability for UI-related specifications. By tying changes to explicit NIFI tickets and maintaining clear commit references, Alex enhanced code traceability and maintainability, demonstrating a strong grasp of frontend layering algorithms and test-driven development within a complex codebase.