Worked on the elixir-lang/elixir and phoenixframework/phoenix repositories, delivering targeted improvements to release management and user authentication workflows. Introduced a quiet mode to the Elixir release process, allowing users to suppress verbose runtime configuration output for cleaner build logs. In Phoenix, addressed a CSS selector issue to ensure server error messages display consistently based on connection status, improving UI reliability. Enhanced backend security by refining the remember-me cookie deletion process, adding options to better manage persistent cookies and reduce stale cookie risk. Leveraged Elixir, CSS, and the Phoenix Framework to align these changes with project standards and operational needs.