Worked on the ktorio/ktor repository to enhance cross-platform URL handling, specifically addressing semicolon encoding for legacy macOS and iOS environments. Focused on implementing RFC 1808-compliant logic while maintaining compatibility with RFC 3986, the work introduced platform-aware encoding to ensure correct URL path processing across different Darwin versions. Expanded the test suite to validate encoding behavior on both older and current macOS/iOS systems, improving reliability for Kotlin-based HTTP clients. Utilized Kotlin and backend development skills to resolve a longstanding bug, resulting in more robust URL encoding and better interoperability for applications relying on consistent cross-platform network communication.