Worked on authentication and documentation improvements across the dnhatn/elasticsearch and elastic/docs-content repositories. Addressed a Null Pointer Exception in the OpenID Connect Authenticator by introducing validation for the Content-Type header before processing token responses, enhancing the robustness of backend authentication flows using Java. Updated JWT realm documentation to clarify support for the 'at+jwt' access token type, improving guidance for users managing JWT authentication. Combined these efforts to strengthen security and streamline developer onboarding. Demonstrated skills in backend development, unit testing, and technical documentation, with contributions spanning both Java code and Markdown-based documentation to improve clarity and reliability.