December 2024 performance summary: Delivered key features and stability improvements across enacting UI components to strengthen testing coverage and end-user experience. In sandstone, implemented a VirtualList QA Sampler that enables dynamic testing of dataSize and itemSizes with the ability to restore initial state and remove items via clicks, providing robust coverage for dynamic rendering conditions. Also in sandstone, fixed an accessibility-related bug in the Editable Scroller by replacing brittle static classname checks with a robust role attribute check to ensure button interactions remain reliable. In enact, resolved a VirtualList scrolling stability issue that occurred when dataSize or itemSizes changed, eliminating abnormal scroll jumps and improving smoothness during updates. These efforts reduce regression risk, accelerate QA cycles, and deliver more predictable behavior for dynamic list scenarios. Technologies/skills demonstrated include React/Enact development, dynamic testing tooling, accessibility-conscious event handling, and performance-tuned update handling.