Worked on the swc-project/swc repository, focusing on enhancing the reliability and correctness of JavaScript minification and renaming processes. Addressed two complex bugs in Rust, targeting property mangling in subclass inheritance and duplicate mangled names across eval scope boundaries. Implemented solutions that prevent property and name collisions at runtime, preserving inheritance semantics and scope integrity. Integrated comprehensive regression tests to validate fixes and maintain stability across the minifier’s test suite. Emphasized code optimization and robust testing practices, ensuring that compiler optimizations did not introduce new issues. The work demonstrated a methodical approach to backend development and JavaScript minification challenges.