Worked on the bytecodealliance/wasm-tools repository to enhance build reliability by addressing nondeterministic path ordering in the PackageSourceMap component. Applied expertise in Rust and systems programming to replace the use of a HashSet with an IndexSet, ensuring stable and deterministic iteration of source paths during compilation. This change reduced flaky builds and improved reproducibility, particularly benefiting large toolchains such as Buck2 in continuous integration environments. Focused on compiler development and build systems, the work contributed to more maintainable and predictable build processes, resolving a longstanding issue and strengthening the overall reliability of the wasm-tools suite for developers.