Developed foundational infrastructure for System UX rendering in the facebook/igl repository, establishing the rendering path using the Stellar framework on the Helix Server. The work included adding Facebook-only code annotations to support secure internal usage and future extensibility. Focused on C++ development, UX design, and system architecture, the approach laid the groundwork for controlled rollout and maintainability. Subsequently, addressed reliability in UI testing by fixing font loading issues in XOR-based screenshot tests and strengthening the file-loading mechanism, which reduced test flakiness and improved stability. Demonstrated debugging and testing skills while collaborating across teams to deliver targeted improvements to the test suite.