During June 2026, contributed to HeyPuter/puter and biomejs/biome by delivering two targeted features focused on backend reliability and CSS parsing flexibility. Developed a directory naming deduplication mechanism in HeyPuter/puter, enabling users to create directories with identical names by appending suffixes, while ensuring robust permission enforcement and comprehensive test coverage. In biomejs/biome, extended the CSS Modules parser to support comma-separated composes values, allowing multiple class imports from various sources within a single declaration. Leveraged Rust and TypeScript to implement these solutions, emphasizing maintainable code, thorough testing, and improved collaboration across repositories without introducing regressions or unresolved bugs.