Worked on the emilk/egui repository to implement per-viewport label text-selection isolation and lifecycle management within the Rust-based UI framework. This feature restored independent selection states for each viewport during painting, ensuring that label selection in deferred viewports remained consistent and unaffected by unrelated viewport passes. The solution involved keying temporary state to each ViewportId and routing lifecycle management and label painting through the current viewport context. Regression tests were added to verify cross-viewport isolation and prevent future issues. The work demonstrated strong skills in Rust, software testing, and UI development, with a focus on stability in multi-viewport scenarios.