During December 2025, contributed to the sst/opentui repository by implementing per-element opacity support within the Renderable class, enabling adjustable transparency for UI elements. This work involved modifying the rendering pipeline to include buffer push and pop operations for opacity, ensuring that transparency is handled robustly throughout the rendering process. Developed comprehensive tests to validate opacity behavior and enforce value clamping, which improved reliability and code maintainability. Focused on enhancing the flexibility and visual consistency of the design system using TypeScript, Zig, and front end development skills, while prioritizing test coverage and documentation for traceability and future extensibility.