Worked on enhancing authentication robustness in the puma/puma repository by addressing a critical bug in token parsing logic. Focused on backend development and API security using Ruby, the developer fixed an issue where authentication tokens could be misidentified if the query string contained multiple delimiters such as '&' and ';'. The solution involved refining the parsing mechanism to correctly extract the status application token under these conditions and adding regression tests to ensure the fix remains reliable. This targeted update improved the reliability of authentication flows and status checks, supporting both user access and automated monitoring pipelines with increased accuracy.